You say you would like a larger, central college. Supervision groups will be small regardless of college size, so don't worry about that. Other teaching e.g. seminars will be university based anyway.
I'm a scientist, so I can't help with academic considerations, I'm afraid.
Do you have any preferences in the other areas mentioned? Something else to consider is dining - would you want to dine in college most evenings, or have more freedom?
Whatever you decide, I'm sure you'd be happy there - most people grow to love their colleges.