Remora fresh in the box:
Remora and a Excalibur HV1:
Some Remora Skimmate:
For comparison, here is some Excalibur HV1 skimmate:
And here is the Excalibur overflow / bubble box:
I like the Remora myself, but the Excalibur is a better skimmer
IMO, and cheaper. The Excalibur got more skimmate, that was daker, more quickly than my Remora ever has. As a downside, the Excalibur is harder to clean and the Rio pumps that fit in the overflow boxes are flaky.
Currently I use the Remora and the Excalibur is in my basement waiting to be used on a a bigger tank. My tank is only 15g, I am not too worried about losing some efficiency. The Remora is just super easy to use and I even stuck my heater in the Remora. The Remora also looks way better on the back of a small tank, this was important in my current setup.