Mine wold have to be Capcom. They've made some really great games, and continue to.
Yours?
Bandai Namco Games and Square-Enix. ;)
Used to be Sega.
Capcom by far. Nothing else comes even close.
Suda 51
Atlas
or Bandai Namco
Both are companies that have some of my favorite series.
Capcom. They've made so many awesome games, and they still make awesome games.
Konami is a close second. (Mainly because of Castlevania.)
I know it's going downhill, but SEGA.
Capcom is pretty high up there, but the only Capcom game that I have is Mega Man X collection. I love the Mega Man games, but I rarely buy them.
Capcom.
They have so many awesome games. I always enjoy playing their games.
Even though it's a subsidiary now, mine is still Taito. Two of my favorite titles are their properties (Lost Magic and Bubble Bobble) while they also have Space Invaders (which has seen an excellent comeback courtesy of Taito this past year).
Sega. I know Sonic's been down lately, but Unleashed showed promise, and I still have hopes of Adventure 3 and/or a comic-based game. Plus, they're helping with Conduit, which is supposed to be the Wii shooter we've been hoping for ever since we first heard about the "Revolution."
I also like Square-Enix and Bungie (<- now technically a third party).
ATARI!
Then Capcom
Capcom, easy.
Capcom, though Square-Enix and Konami come close. Sega probably comes next.
Square-Enix, even tho it is going a tad downhill, konami, capcom. And Camelot, but not for there tennis games. MAKE GOLDEN SUN 3 ALREADY!!!
Capcom and then Sega.
Capcom
Konami
sega
Capcom.
Square-Enix, love the DQ games
Marluxia, Camelot is Second Party.
I'm revising mine....Taito was bought by Square a couple of years back, and I love some of their series too. So my vote goes to Square Enix.
Capcom for me.