It depends really, if we're just counting vanilla SADX then I'll defs go for SA1 Dreamcast, it's just better and lacks many of the issues SADX had like the weird enemy behavior from the frame rate increase and less visual glitches, vanilla SADX just looks like ass. It looks like ass specially on PC, like the ocean water legit looks like acid or something and let's not mention the infamous lack of lighting in the mystic ruins. I wonder why they removed the more advanced lighting engine from the Dreamcast version in SADX, I find that kinda ironic considering how the GameCube was one of the most powerful consoles at the time, I just assume they gave up trying to port it to the GCs graphics chip and just made a new one entirely with little effort.