I don't have any experience with the Ecotech, but VarioS has been what I've been using. PremiumAquatics has them for 30% off right now, best price I've ever seen on them (picked up a spare return).
The features I like are controllable with Apex and the auto shutoff float-switch. Both not 100% needed, but they work well that I've set them up.
Also, they are completely silent. 0 increase in decibels when on.
I run the VarioS-4 for my return and VarioS-2 for my reactor/chiller line.