Naiad-Have had no problems, work very well. PTO is from generators, but we run 24/7 if not docked so not a problem.
Now, less experience with, but love so far Side-power/Sleipner Vector Fin stabilizers. We have them on a 65' Sunseeker and they work great. What we don't know is how they would perform on a Trawler as we're only aware of them being used on planing hulls.
I have no experience with Trac.
We have stayed away from Gyro so far. The spool time is one reason and the noise a lesser reason. Plus, we're just not as comfortable with their dependability yet. Note that we have reservations on the Side Power too even though we respect the company and their other products and have heard of no issues. They just don't have all the applications Naiad has.