It really won't make a difference. You'll be learning the same a levels/btecs/qualifications in both. Neither gives you a better advantage.
Only times a uni will care is if your college/sixth form is contextual. So if your school has very poor average a level grades unis may consider that you were at a 'disadvantage' perhaps with the resources given, and take it into consideration when offering you a place. They don't care if you go to the same sixth form where you went to school, or the local college, or if you manage to get into an expensive top of the leagues selective college. They care about your grades.
Pick whichever one offers the subjects you like/want to take, which seems like better for, friends' choices, how far is it, do you have to pay etc. I only went to my sixth form and the top college in the UK's open days. The top college strived for 'academic excellence' and sending students to oxbridge/prestigious unis - things I really value. I enjoyed both but in the end I decided to stay at my sixth form as I wanted to stay with my friends for two years, wasn't ready for the big change, and didn't want a 7-5 school day. With my grades I likely could have met the scholarship requirements if they accepted me, but I feel more comfortable where I am now, which is by far nowhere near the top sixth forms in the country. However I can do the A levels I want, I know the teachers so they know my potential and my classes are small so I can have more one to one time with teachers on concepts I don't understand.
It's your choice - neither will give you more of an advantage than the other when unis consider you. Just work hard, get the grades, try your best.