in addtion, pressure side cleaners help to distribute water and chemicals throughout the water and also help equalize the heat in the pool since you have a moving return line, so to speak. If your pool has a lot of large debris like leaves then a pressure side cleaner will work longer before clogging up. Also, your filter and pump basket stay cleaner with a pressure side cleaner. Also, pressure side cleaners allow your skimmer to work at full capacity while the cleaner is operating. Suction side cleaners are usually plugged into the skimmer port and disable skimming unless you buy and expen$ive vacumn plate for your skimmer that will allow both to work but at a reduced capacity.

IMHO, if you are plumbed for pressure it would be a better choice. Most of the people using suction side cleaners do not have that choice.