I will give my two cents on the matter.
I recently completed a Level 3 Extended Diploma in Media Production receiving a grade of DDD.
With this I have been accepted into Bournemouth University for a BA in FIlm and Cinema tography
which is one of the best in the UK
across multiple subjects, but especially for film and Television.
Having been a Level 3 Extended Diploma Student, I can safely say that it is not a walk in the park.
The course required me to be extremely consistant academically where the lowest grade in a unit will
decide my final grade for the whole unit. Example of this is if I'd get 3 distinctions in a unit and
a pass, the pass would be my final grade.
Some people do piss about on the course and are carefree but they receive Merits and passes at the most which is
pretty sub par.
The work consisted of countless essays, pre production documents produced to industry standard
and producing the actual content such as Dramas, Adverts, Documentaries, Multi camera TV shows etc.
I would also receive many other assignments not part of the course to create media products for
multiple clients. I have created promotional videos for a variety of companies and have compiled
a showreel of content showcasing a large variety of genres.
I would often come into college extra days and work way outside of my timetable to produce good grades
on my units and to make strong clients and contacts within the industry.
Being on the course also put me in contact with the National Union of Journalists where I received my Press card, many
beneficial contacts and support.
With this established it is quite clear that I have gained a huge amount of experience from being on the course.
The majority of it that is simply just not provided on an A levels Media Studies course which provides
sub par equipment and a huge lack of practical and documentational experience which is something that
is essential for University and working within the industry.
Overall I think it simply depends on what subject you are taking.
If you want to practical as a career such as Media Production, Motion Grpahics, Engineering and performing arts.
I highly reccomend BTEC as it will provide much more than a mere secondary sixth form taught A level.
If you plan on taking a more academic, research or theoretical route for a career. I would reccomend A levels.
As it will be more extensive on the theory side of things.
So choose carefully, but some degrees and Unis will respects BTEC more than A levels and vice versa.
My case is a good example. Degrees involving Media Production will favour those with experience in Media Production.
A level Media Studies simply doesn't provide that.