Remember Conquest is a team game so choose your god based on how well you can use them to the benefit of your team comp.
SS = When this god is played, they always seem to do well
S+ = I or others regularly use this god successfully
S = I or others get decent success with this god, more often than not
A = I or others sometimes play this god successfully (choose if you're good with them or really want to learn them)
B = I or others have had some success, but more often not so much
C =I hardly ever see this god have a good match
D = I can't remember seeing this god chosen much (if at all) so can't comment