Nothing particularly compelling about the PS1 versions of any of those games. As someone pointed out, Tomb Raider on PS1 has far superior music, but you can re-add it via a mod. The PS1 version also plays much better with a gamepad (Tomb Raider 2 onwards supported full DirectInput under Windows, so as long as you have a proper DirectInput pad, you're good), but you can use the DOSBox mapper to assign keys to your gamepad with a bit of work.
The PC version of Soul Reaver has some serious problems on modern PCs, even the GOG version, not least in that getting gamepads to work with it is an absolute fucking nightmare. If you play Soul Reaver on PC, be prepared to play with keyboard (you can use something like XPadder, but it makes the controls too sensitive).
Beyond that, the only argument for Riven, Myst 3, Populous: The Beginning and Warzone 2100 on the PS1/2 is the gamepad control if you're looking to play from your couch - their respective PC versions are KB+M only.
There's also the issue that new versions of Windows tend to break backwards compatibility with many old games - increasingly so as time goes on. DOS versions notwithstanding (99.5% of DOS games run just fine under DOSBox), around half of Win95/98-era Windows games outright refuse to run on modern PCs, and those are specifically the games that are congruent with the PS1 era.
There´s a fair number of games that I primarily play on PS1 or PS2 despite there being or me owning the PC version because the PC version simply doesn't work reliably on modern PCs: Dino Crisis, Le Mans 24 Hours, Paris-Dakar Rally, Rayman M, Agent Armstrong, Renegade Racers, V2000, Urban Chaos, Formula Karts, Metal Gear Solid, Rayman 2, Nuclear Strike, Need for Speed: Road Challenge, State of Emergency, Breath of Fire 4.
Post edited August 05, 2016 by jamyskis