I use different compressors (or combinations thereof) for different tasks (e.g. mixing or mastering, drums or vocals, agressive or soft, crisp or warm, etc.). It's just like cooking where you never use the same amount of spices but make your decision based on the food, on the guests, etc..
Sometimes I find that I cannot get the sound I'm after with my initial compressor choice, then I use a different one (e.g. most of the times I use the Vertigo to get a smooth, warm retro sound, but in some cases the rougher character of the PSP OldTimer suits the task better).
The question is whether you use a compressor for purely technical tasks or for sound shaping. Both are every-day tasks though.
Regards,
Steffen