I own them both.
The FEG I have had for over twenty years. I have had zero problems with it. The trigger and sights aren't great, but it is still a pretty good shooter.
I have had the Super B only a couple of weeks. It has been raining so much (Texas) that I haven't shot it yet. I will take it to the range this weekend or early next week. The trigger and sights seem a little better than the FEG. It looks like it was barely ever used, so I am not expecting mechanical problems.
They are both full-sized, steel-framed, single-action 9mm service pistols. They even use the same breech locking system. The FEG is maybe a tiny bit smaller/lighter, holds about 13 rounds (double-stack magazine), might fit most hands a bit better, but has slightly worse sights and trigger.
The Super B is maybe a tiny bit larger/heavier, holds about eight rounds (single-stack magazine), might not feel quite as good in most hands, but has slightly better sights and trigger.
They are both a good deal for $250, IMHO.