I think all of those types of filters have their reasons for existance. There are some people who still swear by UGF's, some people who wouldn't ever go back to a HOB after having a Canister, some people who wouldn't ever get anything besides a whisper
Personally I'm happy with the normal HOB whether its a proaquatics, whisper, AC whatever...and I think when/if I get larger tanks I'll look at canister filters or another option.
I think they all "work" well...as long as they're applied in a tank that fits their ideal environment and are properly maintained. If they didn't work well I dont think they'd be on the market.