I think Sawyer is more attuned to something like Fallout, in which the driving point of the game is not that it's well written or that it has a good story but the fact that you can play how you want, solve quests in multiple ways, create a lot of different kinds of characters that result in different gameplays and other features that focus on roleplaying. At the same time, if he actually manage to make his historical dream rpg at some point, I wouldn't expect it to feature a great narrative, but I would expect lots of roleplay opportunities, the chance of doing things differently based on the PC's build, no essential characters (everyone can be killed is something Sawyer stresses out a lot of times as something important in his games) and also some faction and reputation systems. Also turn-based combat and a classless system.
Avellone on the other hand is more skilled as a writer and better suited for narrative heavy games, but they also tend to be more linear and with less freedom in how you play it. This is true both for P:T and KotOR II: in New Vegas you can decide to go directly to the big city passing through Sloan, it's very difficult because of the deathclaws but you can find a way and do it, in Torment you can't get out of the mortuary and just go to Curst if you don't do the previous steps of the main quest, in NV you can meet House and kill him, in Torment and KotOR II key characters can't be killed before the game allow you to do it, in NV you can do whatever you want with your companions, in KotOR II most of them are imposed on you even if you don't want them. They're two different styles of rpgs, and I'd say that Avellone is better at providing good stories and characters, so he would be a better pick for a narrative rpg like P:T or MotB, but not for something like Fallout.
