Which HIK turret cam - 3MP or 5MP?

Looking at upgrading my outdoor home cameras, as I am having a lot of trouble with sipiders on my current bullet cams.

So I have narrowed it down to two (I think) turret cams, the DS-2CD2335FWD and the DS-2CD2355FWD.

Obviously one is 3MP, and the other is 5MP. But the 3MP version has better low...

Which HIK turret cam - 3MP or 5MP?