I have about 10 tanks the last time i looked
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.. I have alot of different filterz.. I also use some aqua tech from walmart [good filters], have an emp.400 and 280[work good nice media compartments], 2or3 Ac500/110's [very good filters]keep em clean or you get empellar noise,my fav so far on HOB's={Hang on Back/powerfilters}flexability is key; 2 penguins a 100 and 200w/biowheels[[not a problem out of em]; 1 skilter [interesting features]filters good and has a skimmer built in ; 2- XP3's by rena[best filters i own IMO] very quiet! large media baskets,flexibilityi n media and can go a long time before maintaining them. A+ ;Canisters are nice! But not really needed on smaller tanks IMO, but nice to have along with HOB's with larger oscar tanks 55g and bigger. I have 2 DIY sumps[1- 5 gal. and 1- 20gal. These are also nice for larger tanks with messier fish, also with your choice of HOB's.
I think all filters have there strong points as well as week ones, It is up to you to pair em up and/or select rite filter for you. Maitenence is key a feature for me.