I wouldn't classify myself as a "fan boy", but have been pleased with the RENA XP line as far as canisters go. Eheim and fluval are also great filters though. So are some HOB
options from Aqua Clear, the new Fluval, and the magnums.
The best filter is the one that fits your individual tank, budget, wants, etc. the best. There are pros and cons that come along with any type.