With the Enclave one, you'd have good shit (though weapons would possibly run low on ammo) but your AdvPwrArmr would mark you as Enclave, which would mean the large powers (Vault City, Reno, NCR) would all want you, so you'd have to choose protection over concealment and weather or not to keep your armor.
With the slavers, most people wouild hate you as well.
Personaly, Id like the slaver one more.