Source.
1.6 is boring, the graphics are boring and the maps are boring therefore making me bored.
The good thing about the crappy graphics(compared to source) is I can see people easier and get fast reactions, so after lke 16-2 I get really bored and run around with shotgun, and 1.6 makes shotguns horrible so yah....
Source is better all togehter, I may be wrong but they fixed the whole spray pattern, in 1.6 u get like a perfect spray pattern so if u have an AK or any high recoil weapon, you can just memorize where to spray to get headshot. And the m4 just dominates all with or without the silencer.
In source the weapons are more fair and the spray becomes more random even though there is still a spray pattern.
The shooting through THICK walls thing has been fixed so ppl cant just randomly spray into walls and get HS, well at least not thick walls.
Started playing cs back when 1.5 just came out, the game was awesome and I got addicted, 1.5 was so buggy though, the new steam system made CS like 5x more fun.