Sorry, don`t know anything about KEA as we only visited FW, which my son loved.
He has sufficient marks for FW (just over pass for CHB but we have ruled this out) but also passed on the Warks exam and will definately get a place at KES Stratford (which is my prefered choice if truth be told)
however, myself and DH discussed this, and although the final decision ultimately lay with us, we wanted DS views on what he wanted as well, after all, he will be spending the next few years of his life there.
He liked both KEFW and KES and before the last open day at FW didn`t really know what to do. however after visiting FW again in sept he said that was where he defiantely wanted to go. He liked the idea of a mixed school opposed to a boys only school. we also have a DD to consider in 3 years time.(he also has 4 cousins there who he would be travelling with on the bus, so that was a big plus as well)
Travelling was not really an issue for us, as we are roughly between the two schools, however that is something people on this forum are concerned with as some travelling times for the day are quite long.
have a chat with your DS, get his views on which he would prefer and check out the travelling arrangements etc, then if still unsure maybe a pro`s and con`s list.
Good luck in your choice.