The second one might be "technically better", but i've barely played it.
I loved the first one.
The characters, the atmosphere, the infected.
While the guns are kewl in the second, i hate the characters, i hate the daylight maps (really doesn't have the great feel), & i dislike the infected, especially the inability to do strats like old 3+1, etc.
I look at my
playtimes for games...it very accurately tells me what i like best.