I prefer DoD:S cause it's more team-based than CSS. It would be alot more fun if people actually used their mics for proper communication and not scream curse words and stuff like that.
I dont know about CS:S... i like how its more realistic and all but the gameplay is too easy now... the aiming is way off and its easier to get headshots... steam really needs to fix CS:S, too many problems. yeah if i were you i would go with DOD:S its way cool.