[AmityvilleHams]

I would go with a dwarf in the Detolf. It's best used for the smaller species, not so great for Syrians as it is pretty narrow and, as mentioned previously, short(Syrians should preferably have 12+ inches of substrate).

As for specific species, they all have their own pros and cons. Hybrids can make excellent pets despite being potentially more prone to health conditions and such, but a robo or Chinese hamster would also be a good choice. I would mostly just stick to dwarf species though due to the Detolf's size related issues(not a problem with dwarf species) - beyond that it's really up to you and what you want out of your future hamster.

With the dwarf species the Detolf is an ideal enclosure when set up properly. That means avoiding and minimizing the lack of overhead cover. These are prey animals at the end of the day and not being able to hide can be stressful for them as well as make them less confident in their enclosure, so things like tunnels(stick to natural safe materials as plastic ones trap humidity and such which isn't good for respiratory health) as an example are great additions. There are plenty other overhead cover ideas out there though!