Parties are best if you don't want it to seem like one character is a powerhouse, extremely lucky, etc.
However, with a Party you have to define even more characters, have to make them defined while in the presence of others, etc. You also have to explain why they're together.
Personally I feel a party would be better if not for at least the experience, as if you don't like it Felarya's hostile nature means you can always drop a few.