Do you want to catch them on the left side of their mouth, or the right side?
I am joking. Walleye don’t care! But I can offer you some advice on technique using both, and you tell us what you would like to do.
Many IDA anglers use a bow mount so that they can jig two rods. You cannot do that effectively with aft mounted motor. If you are going to drag, or slip in the current, you would want a bow mount, as an aft mount would make it near impossible if you planned to fish two lines.
So, if it were me, and versitility is the key, then a bow mount is the ticket! With a bow mount you can also get an AutoPilot or Co-pilot, something you cannot do with an aft mount.
What type of fishing do you do most?
Tuck