I never really played 1.6, but I played Source a lot. I've heard the gameplay is better in 1.6, but I prefer the graphics of Source. Can't wait for GO!
I actually like both Counter-Strike Source and Counter-Strike 1.6. Reasons vary between the two games such as Source has better graphics and walling isn't as bad as it is in 1.6, but 1.6 has a lot of modifications that I always found fun such as Super Hero, yes they have all been converted to CSS but it's not the same. I also like the competitive aspect of 1.6 where people are always looking for a scrim or some other type of challenge. In CSS you're constantly running into a lot of laid back people who just play for fun and don't really want any competition at all. Both games have their pros and cons, but are both my favorite in one aspect or another.
