Gran Turismo vs Halo Which Is the bigger 1st party exclusive?

[NYCrysis]

Ji99saw said:

pezus said:

Mr Puggsly said:
No question, Halo.

Gran Turismo couldn't maintain sales as strong if it released as frequently as Halo games.

CoD started releasing once per year and sales increased. AC did the same. Where's the proof?

For one Halo doesn't release once a year, Ubisoft have stated that they expect a weaker sales for the new AC game, And you shall see when GT6 is released if it has a bigger opening than Halo 4 than it's a bigger franchise (Simple), And if it has a bigger opening than GT5 it's  on the increase and can withstand multiple releases

Halo 3 2007

Halo wars & odst 2009

Halo reach 2010

Halo anniversary 2011 

Halo 4 2012. Averages out to one a year.