Grampy, you're right about that, you'll find a similar "hardcore vs. casual" fight in just about any discussable activity. To add, though, I think in every instance the "hardcore" side usually can never grasp that there would be no activity to speak of without the "casual" side, whether it be lack of revenue or lack of membership without the "casuals".

Between those two games? Pokémon. :p

No, but seriously, that's kind of an unfair comparison, seeing as how WoW has been out for years and has an installed base of what, 8 million or something? And they have to pay monthly subscription fees, plus it has all the expansions and whatnot coming out, like that Burning Crusade thing.
Also, WiiFit helps you improve your health and life, while World of Warcraft destroys your life.

Are you smoking crack? The game is probably played by more women than any RPG or just about any game ever made. It is DEFINITELY a casual game or it could not sell 10 million plus. In order to be that successful, you have to crack the casual gamer barrier.

I know a few girls that play WoW (by girls I mean women) that think every other video game on the planet is lame. How is that not casual?

To your point about checking online builds, PVP strats and the like I can say this, you are obviously not paying attention to the whole of the community. There are plenty of players in the higher levels that just play the game with no real technique because their sister/mother/friends are all playing it. The game has really become another big way to communicate with people.

And as another poster has said, just about (hell, I cannot think of one) every other MMORPG is much harder to get into and takes a much steeper learning curve. That keeps casual gamers away. Casual gamers find the most accessible game and latch onto it.

Only reading the OP, it's WoW. Even Nintendo can't beat the cash cow.

10 million subscriptions times 15 dollar / month witch seems to never end = endless $$$

There's a reason why the answer isn't obvious, and it's how long each of the games stay popular. If the number of subscribers drop fast, Blizzards profits see a huge decline from it, since the costs don't drop as fast. Theoretically it could even make loss. Besides, maintainance costs doesn't necessarily split even between years. Anyway, i'd go with WoW.

Revenue's a given

Well, in 2006 (I played WoW) I remember that Blizzard said that they had more than 9/10 of their people working on WoW. That's 90%, or about 2300 people working full-time on it. That's a pretty big payment roll, and they should have had it close to that for a few years.

Wii Fit had what? 100 people? And they can't have been working on it for ages neither, as it isn't exactly a hard to make game (but that doesn't mean it isn't awesome)

WoW doesn't have 10M paying each month, I think it has had 12M players in total, are you telling me that 85% of the players still play?

Of course, WoW is more profitable, but I don't think as much as people seem to think (at least I think they think they think)

In terms of revenue and profit WoW. This argument doesn't really make sense... Except WiiFit will reach more people numerical, so it might be more influential on society's view of gaming. I still think WoW wins in every other category.

 I know a few girls that play WoW as well (by girls I mean hard core gaming women).

One runs a guild of about 130 members. One loges 6 hours a day in the game.

Another will kick yours, mine, and probably anyone you knows ass in PVP.

If WoW is the only game you play, yet you make it your life, you are not a casual gamer.

I am not on crack, 10,000,000 people are. 

"If WoW is the only game you play, yet you make it your life, you are not a casual gamer."

This is where you got me. You see, because you play one game hardcore, that does not dictate you are a hardcore gamer. Sorry. The fact remains that there are a lot of housewives and other demographics that do not normally play games that play WoW. 10,000,000 is a very large number and I am telling you, as a fact, that this number implies there are a lot of casual gamers that are buying the game.

And to top all that off, I am in the "scene" on a lot of games, and can you honestly tell me that there are as many women playing another game of this kind? I mean, seriously, there is no debate here. This game is as casual friendly as an MMORPG has come.