My personal opinion on the 2D Alien Breed games was that they were nice enough but no match for the Sega Alien Syndrome coin-op on which these games were based initially.
Never played any 3D FPS games on the Amiga including the AB 3D series, and not likely to given the cost of accelerator cards on ebay
I would be interested to know two things.
What is the best Amiga specific FPS, is it actually AB 3D v1?
What is the best Doom engine to run Doom WAD files on Amiga A1200?