I ate at both in May just gone, FF wins hands down - wonderful! I ate there more than once it was sooooo good, the steak was far superior to Yachtsman, cooked perfectly, wonderful flavour, good cut of meat, also at the signature potato wrapped snapper and OMG, that was heavenly!
Yachtsman was OK, but not as good as previous visits, the cut of meat I had was not so great, not much flavour and quite a bit of grissle, not bad but just not as good as I remember and nowhere near as good as FF.
This is just my opinion/experience of a recent visit though, I'd always had fabulous experiences of Yachtsman before, but now I've 'found' FF there's no turning back lol