I can't really say which one I think is the best because I only have experience with the Filstar xp3. I also used a Marineland canister filter about 10 yrs ago but it is not fair to compare because I'm sure their technology has improved. I think they all do a very good job of filtering your tanks and it is the features that really differentiate between the main manufacturers. When I researched canister filters about 3 weeks ago prior to setting up my 75 gal community tank that is the conclusion that I came to. I basically chose the Filstar xp3 because it had the ability controland to adjust the flow. I don't know if the others did but I couldn't find it advertised in their spec sheets. Also filstar canisters were the only ones that advertised the ability to return the water via a spray bar in addition to a nozel. I thought I might prefer the spray bar but liked the idea of conveniently having a choice.phiberXoptic said:as far as canister filters go. Which do you prefer. Marinelands Magnum 350's or Fluval's 04 series or FilStar's XP series