I'd definitely go for frozen 'fresh' baits now. I used to use readymades and had a very good record on them, Monster Pursuit.
I think that it depends on what your baiting tactics are going to be, if you are only fishing once in a blue moon, and with single hookbaits then I personally dont think it would matter. But if you were putting a fair amount of bait in over a fair time, then I would have to go for frozen or self made.
My main reason for switching to own mades was that i wanted to change the additives slightly and use something a little different to what everybody else was using, and cut the fish meal base with a bird food 50/50 mix to aid winter attractiveness,(probably makes no difference, whatsoever, apart from in my head!), although I now use it all year round.
Hedge your bets mate and fish readymades on one rod and frozen/ own mades on the other and see what happens. I've always got a small bag of readymades in my rucksack incase something diffrent is called for.
Ry