Apparently, nearly everyone at ME was pooled there. Or they were open applicants allocated there (female of course). But it's still a great college.
Churchill has a high proportion of international STEM students who don't tend to socialise so much (so I'm told).
Kings is the only college to not have gowns for formals or ceremonies.
Homerton is about a mile or so south of the centre, but next to the Education Dept (for anyone studying that), and also near Cambridge Botanic Gardens, the Chemistry Dept and Addenbrookes (for medical students). It is perhaps the largest and most diverse college - rep for being very down-to-earth and friendly. Lord Woolley is popular with students across the uni and often on TV etc.
Gonville is the only college to have compulsory weekly formals.
Jesus is a popular college - huge grounds.
Trinity and St John's are no more 'posh' these days than anywhere else.
Newnham is particularly known for gender politics activism.
Lucy Cavendish was all female until two years ago, but now 50/50 so no advantage to boys applying there any more.
Whetever they go, they end up going in most of the other colleges anyway, depending on modules and social life.