Harris Westminister vs Twyford

Iv got offers from both above sixthforms but not sure which one to go to starting september as Harris Westminister seems to be really good with UCAS but Twyford High School in Acton's A level results seem better.
Could someone help give me some insights into extra curriculars at both and just generally which one would be better as im on the edge about both.
I will be studying Bio Chem Maths n Econ.
Any help would be appreciated )