My personal experience is that often games for PS1/PS2 will run faster than the equivalent PC version,
BUT
will also have not as good graphics and fewer "goodies" than the PC version.
I hold this to be because the gaming consolle may be optimized for a specific set of instructions, BUT will never be as good as a PC when it comes to mass memory (memory card/module vs. hard drive) graphics (often the consolle microchp will have to do all jobs, unlike the PC's dedicated chips) and overall speed (the PS3 lags way behind a modern PC)
So I prefer a modern (or even 6/8 y.o.) PC to a consolle... anytime...