Is there any resource which shows how popular a slot is?

[IguanaBob]

William Hill often does "battle of the slots", pitting various slots against each other which a prizepot shared between everybody who bet £10 on the most popular slot. At the moment they're pitting all 7 of the Big Bass games against each other. I'd much rather play just the guaranteed winner or just the top favourites rather than play them all, but I honestly have no idea which ones are most popular. I know a general resource won't necessarily be accurate for any individual casino, but some indicator might be good, not just for this one for the next ones too. (For this one I think in April I can skip the Xmas ones, but even then I'm not certain, maybe Xmas Big Bass is popular year round)