I've had and used both...I like my Motorguide...its never let me down and is stout as an ox on my ranger. I do like the spring on the all terrian and I really like the gradual coming on of the motor instead of instant power. I think that saves on juice and probably spooks fish less.
I'm with the others though...if it pulls my boat...and doesn't kill my bats after just a couple hours I like it.
"But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.” Joshua 25:15