There are a few things about dwarf hamsters. 1. They will eat as much as syrian, because they have a faster metabolism. 2. Some will live together and some won't. That depends on the hamster itself not breed. 3. There isn't a breed that bite more, or bite less, but there are hamsters that bite a lot and not at all. 4. If you want your hamster to have companions, then better get more than 3. There is a higher chance for 2 hamsters to fight. 5. Better don't get more than one male hamster. One will live fine on its own. 6. In my experience male hamster gets along with you. Most female hamsters don't like to be bother too much, because they may have pups at anytime, and they need to keep the pups safe. Roborovski is the smallest of all hamster, but it can live up to three years like syrian. I would get more than two of this hamster. My friend had 4 female, and they lived fine together. You may hear more people complaining that this type of hamster bite, but this may be true, because robo hasn't been domesticated as long as others. I never have any chinese dwarf, or hear much about it. But, it has a longer tail than other dwarf, so some people will call it rat-like hamster. When you say russian dwarf, there are two types of hamster you are talking about. One is Campbells Russian hamster, and other is Winter White Russian hamster. These two types looks exactly the same, but are totally different subspecies. More people refer the Campbells hamster to the Russian Dwarf, and Winter White Russian to Siberian hamster. The Siberian hamster will turn white during winter, starting from September, and Campbells will not. I had both of these hamsters, and not even the vendor selling the hamster know the difference, because I picked the two hamsters from the same aquarium tank. And it was until winter when one started to turn white I realize that I had bought a winter white. Then I notice that winter white has a rounder nose than Campbells, but most people can't tell the difference. This hamster had never bitten me before, but they did fight even though one is male and one is female. I had to separate them into two cages. My friend owned about 8 Campbells in one storage bin, and all of them live together. She had never heard them fighting or anything. There isn't really a best one, but I love my male Campbell, he lets me hold him and even if he ran away in the house he came out after a while, but if I let my female winter white run away I will have to go and find her. I had my first two hamster when I was about 9 or 10. Hamster as pet wasn't that popular at that time, and hamsters were expensive too. I didn't do any research, so I used to bath my hamster with water, and dog shampoo. But, my hamsters never bite me, and they even swim in the basin! If you want to get one then get a male one. There are more fun with male hamster than female =) If you want to get two, then better buy females, and be willing to buy a new cage anytime if you need to separate them. Edit: Teddy is hamster like those in hamtaro. It's syrian, not dwarf. Good luck!