they are two completely different games it is hard to compare them and say 1 is better than the other cause it depends on what the gamer is in to. Halo is a good shooter, not the best and portal is a good puzzle type
A think you need to choose strategy or fps that is the easiest way to decide halo lots of action portal lots of thinking you decide.
depends if ur a puzzle person portal 2 would be better...if ur like me into shooting games than halo odst would be better...
thnx guys i got halo 3 OSTD