def fuid- all the same or stick with blue def?

[willeo6709]

I am picking up my first def fluid diesel- a 3/4 ton cummins ram- tomorrow- and I see several  brands of def fluid out there- and I realize this small equipment  ain't much- but are they all the same or just spend the extra buck and go with the more name brand?  I don't think there is a big rig stop closer tha 1 hour with def at the pump.... I am probably talking the 2.5 gallon " wine boxes".