After some testing I will be going back to TMO again for now. The smoke/fire effects are indeed prettier, but my machine seems to have problems with them. And also I could not find any readme about what in particular has been changed, so, can you guys tell me what the "bigger" differences are between TMO and FOTRSU except Sound and Graphics, which are obvious.
And holy moly that OM+OMEGU looks pretty nice. Going to check that out very soon.
And yes, after going to hell and back with SH5, I already found heaven while playing SH4, especially with TMO.
Thanks for the Multi-install advice. I guess that would come quite handy when testing multiple mods!