The original FF7 is great, and the Steam version is compatible with mods if you want to get updated models/FMVs/etc. Without those the graphics are a bit dated. It was designed for the PS1 era and the Steam release is basically just the 1997 PC version with a new wrapper.
I enjoyed FF7 as my first entry into the Final Fantasy series. It is quite different in terms of combat from the Remake, but the underlying Material/ATB systems are very similar.