In my opinion the pros are:
- people can't use exiva so if you have enemy there probably they will not distrub you
- items are cheaper there
- is no power abuse there
- is no "dominando" server there
In my opinion the cons are:
- tibia coins are expensive there
- is not worth to transfer expensive items with you (better sell it and buy again on non pvp server)
- when someone make you mad you can do 0 against this person