Which Dwarf is right for me?

[Hamsters Equal Happiness]

So I've been preparing for a dwarf hamster, but can't decide which type. I'm only getting one, male preferably. I will be going back and forth every week since my parents are divorced... So he will be going in a carrier from one terrarium to the other. The houses aren't a massive distance, just a few minutes. Everything will basically be the same (double) for both of my houses and his habitats. I plan to just get two 10 gallon tanks with natural settings. I won't handle too much but I do have two italian greyhounds. One goes back and forth with me as well, although he's not too interested in the little creatures. The other gets curious about them, but basically wants to frolic with them. There will be no children messing with him, either. He'll be in my room without too much action to stress him out. I love the size of robos, but don't prefer their speediness. So this was just same basic info for you guys.. Thanks for the help!