I have gone with aviationexam.com which seems to test knowledge more. During my first 4 exams I was getting passes on this site, a few says before the exams I flipped to Bristol and was getting high 90's - which was a confidence boost which carried into the exams.
It depends, I think, on if you are doing the full heli only ATPL(H), or the intermediate one. Your profile doesn't say where you are, but for the UK I'm sticking with aviationexem.com for study then a flip to Bristol in the few days before each sitting. One good thing about the site is it keeps track of everything you do, so can highlight areas needing further work.
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