Hey Sas, I have the Remora C PRO, of the 3 in the Remora line that Aqua C offers. I have not tried the MJ yet. I understand the hole bigger is better thing, and that is why I chose a Remora Pro for my tank, I don't want bigger is better and I want the pump that is going to work with my skimmer and tank. This is how they sold it, I bought the package and did not compare pump rates to get maximum juice.
"The Remora Pro is a larger, more powerful version of our popular Remora. This skimmer is capable of handling a 120 gallon fully stocked. The Pro is available with two different pump options - the Rio 1400 or the Mag Drive 3. If you have a larger tank without a sump, the Remora Pro might be the skimmer for you." ~
"The Remora is an efficient hang-on skimmer that does not require the use of a sump. Simply hang it on the back of your tank, plug it in, and you're ready to go. Just like our larger EV models, the Remora is driven by a powerful spray injector and a Maxi Jet 1200 pump."
"The Nano Remora is virtually identical to the standard Remora, except that we shortened the overall height of the skimmer so that it would fit on a nano reef. Driven by a Maxi Jet 900, this skimmer is capable of maintaining excellent water quality on smaller systems."