It's bigger than Halo:Reach as well brah.

It has become clear you have no logical argument.

Of course it sold more than Reach. Another Halo game came out in 2011 and another in 2012.

Your non sequiturs are adorable but won't win you any arguments :)

Neither is a 1st party exclusive so the discussion is pointless. Halo isn't platform exclusive either (PC).

Just when I thought your arguments couldn't get any stupider. Lol.

I'm sure Halo: Combat Evolved Anniversary edition really cut into Halo:Reach sales...hahahah

I'm also sure Halo 4 cut into Halo:Reach sales when it was barely managing 10k a week prior to its release.

Zzz...bring facts next time, you'll fare better.

How are they not 1st party exclusives? And saying Halo isn't platform exclusive because of PC is like saying GT PSP makes GT not platform exclusive.

1. No, we were both discussing profit. Go back and look. First, you started to imply that Halo may not have been as profitable because it was expensive to make, then you said you agree it probably was more profitable, and now you're trying to say "relative profit" or whatever is more important. As for your example, you were obviously more profitable and the other guy obviously reached a larger audience size. Not sure what's so confusing. Furthemore, Halo sells a hell of a lot more copies during initial release, which means it sells more copies at full price, and makes even more profit there.

2. I see you're trying sneak in words like "popularity" to change the argument. We are talking about how big a game is, using audience size - people who play the game - as the metric. So yes, Mario did decline in audience during the GC era, since there were less people who played the game. Popularity is too unpredictable to be considered in these situations. For example, Sonic is probably still a very popular character, but to say he's big would be misleading, unless of course you're only concerned with how many people know him, rather than how many people are interested in buying a game. For that, audience size is a better metric.

3. If a fad could change in America, it could change in Europe. Yes, Call of Duty could grow stronger but I don't see why that should be a problem for Halo. Call of Duty saw tremendous growth this generation year after year, yet Halo seems to be relatively unharmed. If anything, CoD has helped Halo by exposing more people to the FPS genre. You have failed to give an example of anything that could happen to Halo that would not also happen to Gran Turismo. 

4. The last three *major* Halo releases are Halo 3, Halo: Reach, and Halo 4 and have sold well over GT5. You're probably trying to include Halo: CE Aniversary, Halo: Wars, and Halo 3:ODST as major titles. In which case, it is you which is being intentionally obtuse, since you know very well that these titles are no more major than GT5: Prologue. The leap of faith is on GT because, as I've said twice, GT's sales have been stagnant since it's inception, something you continue to ignore. 

5. If that did happen, then that would be indicative of people losing interest in the Xbox 360 and transitioning to the Nextbox, not losing interest in Halo. The fact that Halo 4 has been outpacing Halo 3 should put out your claims that it's on the decline.

6. Unique users are usually considered people who buy and play the recent installments, not old-time fans who may or may not buy a GT game in the future. 

Like Jay520 said in his thread, "bigger" is a vague term. However, in this gen Halo did better in more criteria's. So if I had to choose I'd say Halo.

Except the OP specifically mentions All-Time, which would incorporate this gen as well as all previous gens...rendering your analysis obsolete.

Oh, I missed that. If it's all-time then yeah GT wins.

Edit: actually it's still very hard to decide, but I guess this time GT wins in most criteria's so it is bigger.

My bad, there were some changes made on 06 or 07 but Polyphony never became independent. Bungie is no longer tied to MS but the newly started 343 group own the "Halo" brand as far as I know. It's a question of whether or not to retroactively count or simply add the first three games into 343's portfolio to make them 1st party as a whole it as 1st party exclusive then, and there's still the matter of the PC versions.

Even still, it's a fairly silly discussion. MS fans will say "Halo" and Sony fans will say "Gran Turismo".

In terms of sheer sales, GT has it in the bag. It had one more generation to do it on though, discounting the 5th gen leaves the two franchises basically equal in sales, then there's the difference in attach rate, Halo clearly has a higher attach rate than GT. There are many ways to spin this to one's desire.