i've grown lowryder 2, diesel ryder, and the joint doctor's auto ak-47.
my favorite has been the lowryder #2. Seems most potent to me, also finishes quicker and easier to grow. I have one right now almost done and she's turning purple! smells unbelievable as well.
but if you're looking for the shortest plant go with the ak47. I used 3gal pots and none of them got above a foot tall. the high was okay, not as fun as lowryder, more indica. it can take around 80 days to finish. a pretty decent smoke.
some of the diesel ryders can get tall, i had to tie one tall freak down. yeild isn't as good, but she's beautiful. tastes and smells amazing and great heady high.