How important is your work experience when applying to uni in uk?

I’m still torn between what major to pick for my university so I haven’t done much work experience, I was wondering how important it is or is writing a good personal statement enough

As above with undergrad studies.
With postgrad studies, I think it can make a fairly decent difference. I graduated with my BSc in 2018 (2.2) in Biomedical Science, skipping a couple of years picked up a job in the COVID labs.
With some experience under my belt and a slightly underwhelming grade (2.2 due to unforeseen issues in my final 2-3 months), I went back to my original uni (UWE) and managed to graduate with a Merit in my Masters in the 23-24 academic year. With several years experience and now my MSc, I am getting interviews but it appears there has always been someone better in them than me… just hoping Wednesday’s one goes better (honestly couldn’t get a better job but this competition is going to be super tough as these jobs are unheard of).
Tl;dr - Undergrad, not so much but can have some sway if it’s in a field which involves medicine and picking up some voluntary experience is useful as you can say you have had first hand experience.
Postgrad, can make a good chuck of difference!

Good luck with your interview

I’m still torn between what major to pick for my university so I haven’t done much work experience, I was wondering how important it is or is writing a good personal statement enough

Uni subject?

I’m not sure between business and biomed (i know that’s rlly different) but I was planning to do portfolio for both subjects

I’m not sure between business and biomed (i know that’s rlly different) but I was planning to do portfolio for both subjects

I just want to mention this now before you make any decisions because I've seen too many people fall into this pit and not get out. Look into IBMS accredited vs non-IBMS accredited courses.
RG unis are all not accredited
The differences are as follows;
IBMS accreditation = you can work in a diagnostic laboratory as a clinical scientist or healthcare scientist (one of the requirements of working as a healthcare scientist is to gain HCPC (health and care professions council) membership and you can only gain this by doing an IBMS accredited degree.
Non-IBMS accreditation = You CANNOT work in a laboratory

You dont need work-experience for either - and I'm not sure what you mean by 'portfolio' but you can't / don't submit any extra info to Unis for either of these subjects - you just complete the online UCAS application form.

Thank you so much, I didn’t even know this was a thing🙏

Then what makes applicants stand out from other applicants? (Other than grades)