witch of these two filters are better at filtering.

[plant boy]

My question is a fluval or a eheim ecco better at mechanical and biological filtration.

[cocoa_pleco]

IMO fluval

[toddnbecka]

Fluvals pump more water than eheims, more bang for your buck. Eheims are good filters, but you may want to supplement the water flow/circulation with a powerhead if you're heavily stocking the tank.