I've not played the console version, but it is my understanding that Valve have been supporting the PC version and neglecting the console versions. So with the PC version you will have extra weapons which can be unlocked as well as extra maps and extra game modes plus all the other game tweaks they have done.
The PC version has a very big community so you will never be short of people to play with. Like any PC multiplayer game you will have good servers and bad servers.
My prefered ones are the THG servers and H|H servers.
THG #1 - 89.145.117.74:27025
|H|H| TF2 #1 - HH1.THEHH.CO.UK:27015
Lots of people like the GTFO servers as well (not my cup of tea really!), but look out for them.
Also with the PC version you obviously have mouse and keyboard control which I personally very much prefer plus you will have the option of better graphics if you have a capable enough PC.
Not everyone will use voice comms but I always find if you make the effort yourself, you will have a few people join in as well on a decent server.
So in short, I can't tell you whether it is better than the console version, but what I can tell you is the PC version is one of the best online multiplayer FPSs in years!