I think buying a hardware compressor is still a great idea... they cost a bit of $, not many folk have em, it will give your recordings a unique sound...
However.. Do I think a hardware compressor sounds better than software, "just because its hardware." nope.. do I think you will sound more professional than a guy with the PSP xenon?
Depends on your skill level.
If your skill level is pro, and you have got a hardware limiter, do I think you get a unique sound? Yes
Hope that makes sense...