My experience is that I have never ever considered which motherboard is "better", and I am still here to talk about it

Timing fix...biming shmix. I have played with many A1200's and many A1200 accelerators and never worried about any timing fixes at all. That's not to say they weren't done to any A1200's I've played with, or that it never needs to be done - just that I never had to worry about it.