I think there is more than one pleco that is sometimes sold under the name Bulldog/Pitbull pleco but the most common is the Rubbernose/Rubberlip Pleco. I've read that pitbulls like interaction with each other, but IMO
they do fine by themselves in a tank. I've also read that they enjoy large smooth rocks and that seems to hold true with the one my son has in his tank. He often lays on a large stone situated in the middle of the tank when he's not in his favorite little hiding spot. They stay smallish and can have a lot of personality.
, otos are the better algae eater HOWEVER, they are sensitive little fish that really need a well established, planted tank to thrive. They do like to interact with one another, so do plan on getting more than one if you decide to try them. Many have said (and it's been my experience as well) that if you can keep them alive for a month, then they are usually healthy and will continue to thrive.