+1 for this. My friends and I used to LIVE on Blood Gulch CTF. Sometimes we'd have 4 TVs going with 12+ people. It was great. I can remember playing Halo outside on my buddy's front porch talking shit through the window to his room. These were probably the best days of my life, hands down. 14-15 years old.. no responsibilites but to kick ass and take names at Halo. Man I miss it!

As far as the OP is concerned, I'd say Deathmatch is the better testament to individual skills. CTF is definitely more strategy-based, but I think if you're going for pure skill, DM is the way to go.