There are more complex games that run much better on the console, the thing is approach and tailoring the engine for the Saturn.
Examples being Duke Nukem 3D on the PS1 runs in single digits at times, whereas the Saturn version features a tailored made engine that runs much smoother with dynamic lights added.
SimCity 2000 on the PS1 runs a bit better than the Saturn port, specially with bigger cities, this is because developers didn't have time, or know-how to use the second CPU, leaving it idle 100% of the time, this seems to be also true for Alien Trilogy, which still runs great on Saturn, even running on a single SH-2 CPU.
There's an Unreal Tournament port, first two stages on the Saturn that is very impressive, the same developer is showing raytracing, yes, this is true, on the console.
The thing about this Tomb Raider 2 port is that it uses the same engine as the original, note that the game ran horribly on Sony's machine, until Core Design received one of Sony's devs to help with development, then the game run like we see today. A proper and enhanced engine on the Saturn could run even better than the PS1 version of TR2, with dynamic lighting and the such. But this is not something that most people would be able to do, very few people actually know how to harness this console's true potential.
As for the RAM cartridge, the problem there isn't VRAM, the bottleneck there is CPU-bound, Midas Palace on original hardware struggles a lot on the Saturn in the tall room section, probably single digits, the PS1 version runs much better in comparison. The proper approach on the Saturn is to be able to use both CPUs and GPUs as best as you can, in assembly, even Burning Rangers, that is a 3D game more complex than any classic Tomb Raider game is don't use the console's true power, as it was designed using a library to speed up development, it's not using raw assembly, so there's always room for further improvement.
DOOM on the Saturn is a sad story, much simpler than Duke Dukem 3D and still runs as a slideshow, fans improved the 32X version that runs even better than the PS1 at times.
