The tmobile and dev edition are both SIM unlocked and without branding.
Unless you want a half black and half white phone get the tmobile variant. Unlocked bootloader and SIM unlocked are two totally different things. The unlocked bootloader is only important if you plan on rooting and using custom roms.
Thanks. Yeh, I confirmed with Motorola that it's indeed SIM unlocked and that's fine.
What I am trying to confirm is if the 3G and 4G will work in Sweden (and if so with which carriers).
I think it might, at least 3G, but I'd really like to have someone who understands this stuff better than me help confirm that the T-Mobile Moto X should indeed work..