3 GTs since 2001 vs something like 8 Halo games and Halo only sold a few million more? Yeah, GT is bigger.

ps: in europe we dont have walmarts and apparently we're the biggest audience of GT.

If you just wanna look at 3 GTs since 2001, sales drop down to 36 million. Just Halo 2, 3, 4, and Reach (4 games) is about 38 million. :-p

If GT was released more frequently each release would just sell less. GT5 reached its current number after years of bundling and sitting in the bargain bin.

LoL you did what?
You mentioned a wrong prediction of mine 4 years ago. When I asked you to post other examples you failed to deliver. Other than that you were making things up. Actually you made yourself look stupid in this thread. Twice.

And the GT5 vs Halo: Reach comparison would be the wrong one, because it is the first major release of the GT franchise this generation vs the second major release of the Halo franchise this generation. There is no point in discussing with you any further. You will spin things around and try to get away with it as always and it is getting old.

Halo

Their are only two ways to measure how big a franchise is. Profits and current audience size.

If talking about profits, then Halo is bigger.
If talking about audience size, then they're about equal.

We also need to be as current as possible. No point in using data from 2007 to make assertions about the present, when we have better data from 2010-present.

Ditto. Both should have one or two 10M+ seller(s) next-gen

Not really.  Profit is relative to cost.    Audience size is based on potential audience size,  not how big a game is on a relative audience.  For example,  the United States is really the only place in the world that gobbles up Halo.  It's market is mostly saturated.  If there are 50,000,000 console sales in NA and Halo sells 10,000,000 of their copies in NA.   They have a reached a saturation point.   Conversely,  Gran Turismo has an audience base across the World.   

If I were investing into the games,  Gran Turismo as an IP has a larger potential audience size currently.  Profit is relative to the cost spent in creation / marketing / etc.  I'd venture that Halo makes more profit by re-using engines, etc.  Although they spend a lot in marketing it heavily.   

With that being said, the thread title is "Which is the bigger 1st party exclusive" that has to go to Halo.   Not even trolling but I mean Halo comprises most Xbox purchases.  I don't know anyone that would have bought an original Xbox without Halo or  anyone that would have bought a 360 without Halo 3.    And we all know Microsoft has been whoring out the Halo series multiple times this generation.   In short form,  Halo is the only first party game realistically that Microsoft has.  With their lack of first party studios and lack of many other first party games,  Halo is obviously a bigger 1st party exclusive for MS.  

uhh...so do you agree about profit or what?

I said current audience size. You can talk about "potential" audience size if you want, but I've rarely ever heard anyone use that to determine how big a game is.

Besides, GT's audience size has been relatively stagnant for the past fifteen years, while Halo has been rising. If anything, GT has reached market saturation, while Halo has more potential to grow. 

If your definition of "bigger" means "more significant to Microsoft/Sony", then yes, Halo is bigger. But that's a poor argument....the OP isn't asking which is more important for it's relative publisher.

So 8 Halo games sold as much as 4 GT games, looks like GT is more successful. Imagine if it was as heavy bundled as Halo though, GT wouldve sold way more.