You either get the 3/32 if the storage is enough for you or go all the way for the 4/128 if you want a better performance and have higher budget!
Don't get the 3/64...not worth coz it adds extra 32GB of storage only. No extra ram and no extra core/faster cpu in that context.
The extra 1GB of ram on 4/128 really help to reduce lag and prevent lag from kicking in too early in prolong usage of multiple apps be it in the foreground or background not to mention a better cpu.
For reference. The speedy Samsung A9 Pro (2016) is using the SD652, same as Max 4/128!