If you are intending to continue to university, then in general I would suggest considering A-levels in the first instance, as they are designed to be university preparatory qualifications, whereas BTEC qualifications are not explicitly designed for this purpose (although they may satisfy such requirements for some courses at some universities). Presuming that is your plan, it may be fruitful to start from considering what kind of degree you think you would want to do (I would assume something in the business/management/finance etc realm, given your interests as stated), look at the entry criteria for such degrees at universities you may wish to apply to (e.g. those nearby; those you've visited and like the "feel" of if you have been to any for any reason before; and those you've heard of which you might want to apply to) and work backwards from there.
Without generalising too much, broadly speaking those universities in the e.g. the top 5 or so (in terms of league table rankings, which I will immediately say are not really that useful or worth paying too much attention to, but in the broadest sense convey the point) will usually consider BTECs a worse alternative than A-levels, simply because they do not prepare students for their very formal, academic degree programmes as well as A-levels do. It's not wholly a matter of "stigmatization" as much as they know someone from a BTEC background is likely to find it harder, less enjoyable, do less well in the course and perhaps then less well in trying to find a job as a graduate. Universities beyond that but within the top 30ish will usually consider them, but their degrees are still mainly academic courses, rather than vocational, and so you may need to do a bit more work to catch up compared to A-level (or IB) colleagues. Outside of that, they're usually seen as fairly exchangeable, with universities beyond the "top" 30 or so tending to have more varied methods of assessment and potentially more vocationally relevant content.
Neither format is necessarily better or worse, however different employers will look for different backgrounds for different roles. Broadly speaking, a lot of the more coveted managerial/professional level roles (e.g. grad schemes in upper management positions, banking analyst roles, training contracts at law firms and similar) have a tendency to prefer candidates with more academic backgrounds. Other roles, including some overlap with these, such as some professional roles (for example some grad schemes in accounting or similar, especially outside of the big 4) will be less concerned with how academic the degree is, and for some more regional roles or middle/lower management positions, office administrative roles and similar, and certain professional areas which require prior vocational background (such as HR), a less formal academic degree may well be better (or the only acceptable) preparation.
In general though: yes, they are considered by universities, but no, they aren't always seen as equal to A-levels because, fundamentally, they aren't; each qualification has a different aim, so it is in a sense like comparing apples and oranges. There is a Business Studies A-level however, and additionally there is A-level Economics which covers some related/identical content to such courses. In general, courses that require A*A*A* (or in that realm, since I don't think any require those specific grades initially...) will not consider D*D*D* as equivalent to it, because the BTEC is not a traditionally academic course - that is to say, it's not primarily assessed by final unseen written examination. Most courses requiring high A-level grades like that are traditionally academic courses and are primarily assessed in the same/a similar way as A-levels. Part of A-levels is learning how to prepare for these kinds of exams, and these kinds of academic skills aren't necessarily then developed in a BTEC course where the emphasis is on continual assessment through submitted coursework. Thus, you may not be adequately prepared to undertake such exams at university.
However, some universities will consider this in particular circumstances; this may be if you take one or two A-levels in traditionally academic subjects alongside it (which may need to be in particular subjects, such as A-level Maths, for some courses), or for example at LSE if you take some form of additional admissions assessment as part of your application and do exceptionally well in that.
Incidentally due to the overlapping content, quite a few universities specifically state they do not prefer, and in some cases will not accept, the combination of A-level Business Studies and A-level Economics as being two separate A-levels (i.e. you would need to take 4 subjects including both of those, rather than 3 including one of them). I would certainly not recommend taking them together, but taking either one, along with other subjects of interest, is usually acceptable (with reference to the subjects being traditionally academic - as such subjects like Art, Drama, ICT and so on tend to be considered more similarly to BTEC qualifications). If you are aiming for "top" universities you should normally plan to take at least two such traditionally academic subjects, if not 3; if you're planning to apply more broadly to university, it would be recommended to take at least one such subject, and it may be worth considering a facilitating subject to give you more options in what you can eventually apply to.
I would note most of the e.g. upper 25 or so universities don't use the UCAS Tariff/Points system; many others don't besides that. It isn't the most useful metric to compare these qualifications as such.