I'll play Fallout and Dragon Age, and I've got a copy of Oblivion, but I am just entirely uninterested in JRPGs. Whether or not there is an actual choice in either class is arguable. No matter what you do, there's a case that's been written for it specifically, with the possible exception being FO3's pastische presentation. Until we have something like progressive texturing and dynamic dungeon generation which works for stories, this is always going to be the case.
The difference is largely a question of presentation. JRPGs are fond of presenting things like spreadsheets, with additions and subtractions coming off the proper columns. As the generations have rolled onward, WRPGs have worked to obscure this basic mechanic, ostensibly to immerse the player more in the story and environment.
In contrast whenever I see a movie or screenshot from the latest RPGs, they've got that spreadsheet interaction on display with bells and whistles. In some ways it is an embracing of the material as the object itself. It seems to say, "This RPG -is- a spreadsheet. Enjoy the interaction for what it is: numeric." It may be an extension of the wabi-sabi aesthetic found in art and architecture here, where the object is celebrated for what it is: if concrete is used, it is not hidden or painted over, but shown off fully, naked and raw.
