I cant see any role playing concept that relies on using inferior equimpent, unless you want to role play Int or Wis 6 or something.
The only thing we know about the character is that he/she is a wilderness warrior. Statisticly speaking, the player hasnt put in anything about his stalwart using of two weapon combinations, and if he hasnt, then the PC is probably up for using whatever works best for a given situation.
The reason why I said this is because a lot of people seems to think that rangers suck when in fact it is TWF that let's the ranger down, and that the role playing argument seems to be a catch all for using inferior tactics or weaponry when there is no actual need for such an argument.
If, on the other hand, the player wants his PC to be the defender of the two weapon style and he would never dream of using a great sword, then, of course, use two weapons.