I don't know as much about a Maristar (first hand) but if it's a v-drive, generally speaking it will have more room than a DD (engine in back) and will generally ride better in the rougher water. They are also considered to be more favorable for wakeboarding but suffer definitely in the slalom area.
Pros and cons for both boats. You just need to decide what is important for you.
Pure slalom machine, prostar 205.
More family, general use, all around boat, V-drive or Maristar.
FYI - I have the 94 205 which is a slalom machine.....but I also have 3 kids and wife and although a little tight to move around, we do just fine. 205 is great for us because I know the wake is so nice. I would not want to suffer my ski wake for a larger boat (or V-drive). Personally, I would not buy a V-drive in any foreseeable future. My next boat would either be:
2003 197 Anniversary
Nautique 200 OB
MC's new Prostar OB
1994 205, LT1