Only thing intensive is Starcraft 2, which is fairly easy to run. I've played on ultra the whole time but its something that is nice but not important to me.
Performance is not a major issue, I should have enough. One reason I may get setup 2 over setup 1 is, that the desktop setup can be more ergonomic and its more upgradeable. One reason I may choose setup 1 over setup 2 is with 1 I always have my stuff on one device. But the tablet with setup 2 maybe more convenient outside my home since I usually don't need to open up my laptop and type a lot and it will be smaller. But setup 1 allows me to play Starcraft outside the home but I'm not sure whether that is a good thing or not XD .