Lets take the top 3 biggest sellers for each pot and combine them to get a rough indication of the size of the franchises.

Pot 1:

Halo- 25.36 million

Metal Gear Solid- 15.55 million

Gran Turismo- 36.11 million

Gran Theft Auto- 45.77 million

Call Of Duty- 35.1 million

Pot 2:

Final Fantasy- 25.53 million

Mario- 80.9 million

Pokemon- 71.68 million

Zelda- 19.5 million

The Sims- 25.05 million

GTA is the biggest from Pot 1 and Mario from Pot 2.

Those are only the top 3 though, and some series may have declined in popularity (The Sims) or vastly increased (COD) since the originals released. There's also the fact that some are released on more then one platform and others are restricted to one etc.

GTA and Mario myself also, seems to be a pretty good consensus.

GTA and Mario

that's hard... CoD is fragmented and GTA isn't as big as it was... Halo is probably worth more than either franchise... as for the second Mario is in way to many effen games and Pokemon and the Sims are both massive series... of course none of that means anything if we just look at it from a gaming perspective

the better question is why do you think Halo is bigger than GTA?

POT 1 - GTA

POT 2 - Tough call. If we're talking just games, I'd have to go with Mario... If we're going with franchise overall, then I'd give it to Pokémon with all the tie-ins and stuff it has.

pot 1: gran turismo
pot 2 : mario

pot 1:halo
pot 2:mario

Google has all this information, no need to start a thread.

Pot 1: GTA
Pot 2: Mario & Pokemon