[cypher]

A syrian would be easier to handle & tame than a robo, robos are very fast tiny little things, breeder robos that have been handled from a very young age can be fairly easy to tame but pet shop robos can be quite a challenge & some never really become pets to handle & interact with in the way that syrians usually do.
Robos can be kept in pairs but I wouldn't recommend it for someone with no experience of hamsters, most pairs tend to end up needing to be separated when they mature & fall out so if you did get a pair you would need to have a spare cage & the space to house two hamsters separately right from the start as they can fall out quickly at any time.
If you can tell us which country you're in we can make suggestions regarding the best cage.