I know this isn't a decision anyone can make for me but I'd love some thoughts/opinions 
We live in between these two schools and have been to visit both recently for ds (who is in a feeder for R). Liked both but wasn't 'grabbed' by either of them, iyswim. Thought Warlingham had great sports facilities (ds v sporty) and a slightly more 'traditional' feel which I admit I do like, but wasn't crazy about the Head (though to be fair we only caught half her speech!). I like the college system at Riddlesdown (especially as ds comes from a small village primary) and the science focus, but didn't quite feel comfortable there. Not sure why tbh. The kids seemed great at both, btw - really friendly, confident and polite.
Ds is keener on R atm (has recently been there for a science taster day and loved it) but I think he might get more out of W and fit in a little better there. Pfffffft - who knows! What do your dcs like/dislike about these schools - any thoughts appreciated...