Testament just ... well... not-good-enough for a collector. Playability bad, gfx bad, and overall it's quite boring.
Breathless goes well enough to finish it off, although I think Doom has a more complex engine but still it's faster than Breathless, which is weird a bit.
AB3D simply rocks. Like Lotus II in the racing games. Fast, smooth, well playable, etc. A masterpiece
AB3DII was less professional, although still worth to try it at least. It has an RTG patch, but never worked for me somehow.