Depends on the individual.
IMHO.....Jack's are more of a "wet pet." Mine watches me from across the room thinking he's going to get food, and is always at the front of the tank when anyone is in sight. He bites magnet glass cleaners, and bites my feed tube that I use for my catfish. Plus.....They look really nice if you get a good one.
Only problem with JD's now a days is that they get so inbred with all of the fish farms if you don't get a good strain that they can have deformities, not look as nice, etc... So if you decide to go this route, just make sure to look around and make sure the fish look super healthy and good.
But overall.....One of my favorite fish. It just gets a bad wrap for being so common, and can be inbred if you aren't careful.