Help needed picking which TM to get. Just for now only want built in sonar option. I will add I-pilot option soon.

What are the main differences in these two motors? I want the 52" (or is it 54") shaft, 70lb in the power drive or 80lb in the terrova. The foot pedals look different. and the bases look different. Is there an improvement in the stow/deploy with the terrova. Had read some complaints about stow/deploy with the powerdrive. Any help would be welcome.

thanks