Prospective? You may want to choose a different word.
Haha, you're now pelting me with statistics? Okay, two can play at that game. From admission statistics, 62.6% of people who applied to Magdalen was from the maintained sector, but only 51.3% who got in was from the maintained sector. Even on a three year average, 60.2% of people who applied to Magdalen was from the maintained sector, but only 50.7% got in. That's a consistent 10% difference in favour to the pupils from the independent sector, which is not seen from other college, such as Trinity: 56.2% who applied to Trinity was from maintained schools, 49.4% who got offers was from maintained schools, in 2005. On average, it is also more consistent than Magdalen - even more so! Over last three years, 52.6% applied to Trinity from maintained educational backgrounds, 48.4% of those who got offers came from maintained schools. Yes, Trinity does appear to attract, on proportion, more of those from the independent sector than Magdalen - but this can be from either more people from independent schools applying, as you are suggesting, or clearly, it can also be from people from maintained schools not applying. But from these statistics, clearly it is Magdalen who is biased towards accepting independently educated pupils more. If you're going by statistics that is.
I still don't see why you start rating "colleges" as academic - it's the people who get the results, not the college themselves. What if some prat ends up in Magdalen, and flunks completely? Boy won't that lower the Norrington Scores. And if you really want to look at Norrington Scores, look at how pointless they are. Magdalen came 3rd equal this year, with around 74, with 1 2:2 and no thirds. Trinity came 9th, with about 70, but with 9 2:2s and a third. Do you think that small proportion of people accurately reflect the academic life of the college as a whole? I don't think so.
Yes, Trinity is famous for its rivalry, and yes, our JCR handbook does comment on the lefty views of Balliol. However, doesn't it occur to you that perhaps a lot of it has to do with the fact that the two colleges are...next to each other?
And yes, choosing a college is an important decision. I'm just saying that since things are certainly not set in stone, it is important not to get *too* attached to the idea so soon.