I was running the CPR bak pak on my 25 gallon tank but upgraded to the remora pro...and I don't think i ever could go back.
i dont think you can fairly compare the remora pro which is rated to 100g to the Bak pak which is rated to 60 gallons.
The CPR worked pretty well (i was able to consistently get some skimmate) but there were several things that i didn't like, the venturi air intake made a loud hissing sound even with the silencer on, the return tube created a noticeable splashing sound in my tank and a decent amount of salt creep from all the bubbles that popped. The surface skimmer and bubble trap really helped the performance of the BAK PAK, and there are several easy DIY mods that can significantly improve the skimmer. but I was able to get a great deal on a remora pro and couldnt pass it up,
The remora pro absolutely WTF PWNS the BAK PAK in skimmate production (again not fair comparing the 2 skimmers) I used to run the bak pak 24/7 Now I run the remora for only 8 hrs/day and get way more and a higher quality skimmate. There is a simple mod that significantly decreases the sound of the remora injector, but the pump I use is louder and MUCH bigger than what the bak pak runs. The overflow on the remora is absolutely silent, i am still amazed how quiet it is.
So if you can afford it I say go with the remora! although you would probably be just fine with a bak pak, you can get a bak pak for pretty cheap ~100 online. You may also look for a used one, the going rate for bak paks in San Diego is $40-50. and 70-100 for the remora