As far as unscrewing, pumps usually run in a direction that would tend to unscrew the drop pipe.....proper torque on the drop pipe prevents this; 10 ft./lb per HP of motor....so it really doesn't take much torque on a little pump like this to not have to worry about it.
It's really strange that that persists. I wonder why a pump maker hasn't reversed that. I can see it would be confusing for repairs if a well installer went to left-hand threads.
The soft start on the Grundfos SQ would be an advantage I would think. I presume the big torque usually occurs on spin up rather than spin down.
Just comments-- no experience.