How is Alien vs Predator better than Doom? It had better colors/resolution and.. thats pretty much it. Doom is way more smooth and fast and, again, level design is light years ahead.
Zero Tolerance is quite amazing for a Genesis game. Not only the textures on walls/ceilings/floors, it even had external skybox on some levels. It also was the first co-op multiplayer game of all time in console (through custom implementation of the never released Genesis link cable), different characters, destructible environment, camera bobbling, voice clips, blood splats, dripping blood, physical corpses, you can hear enemies footsteps, hand-to-hand combat, bouncing grenades. It has TONS of details, while AvsP on Jaguar has.. almost nothing, it is a pretty simple game.
Oh, and probably the most impressive title screen ever seen in a 16-bit game.
Elevators:
Destructible enviroment:
Enemies attacking from the floor and ceiling. Good luck finding other than walking aliens in AvsP.
Tons of enemies on screen. Framerate certainly takes a hit, but AvsP is slow even with one alien on screen so..
Blood splats on walls.
Non-orthogonal design.
Slopes.
Outdoor levels + skybox.
Windows.
Bouncing grenades + destructible environment.
I don't want to be an Alien vs Predator hater, since it's not a terrible game, but seriously, this game blows AvsP out of the water when it comes to gameplay and complexity.