[Q] G900A or G900T for ATT LTE?

I am ATT customer. I am considering buying the Samsung S5 and am trying to decide between G900A and G900T.

I understand G900A is meant for ATT and G900T is meant for T mobile.
I read also that G900A does not have LTE 900 band.
Can someone explain to me, if I am better off with G900T even though I am on AT&T - because I travel internationally.
For example, in the case of Note 3, I was told that N900T was better than N900A, even though I am on ATT and the N900T - note 3 Tmobile version works just fine on ATT.
I am wondering if the same applies for G900a also?
My primary use for the, rooted, unlocked G900T is on AT&T network... 90% of the time. 10% of the time for international travel.
Is it true that G900T is better than G900A for my purpose - something about G900T having an extra LTE brand and that it is easier to unlock than G900A?

i ordered the samsung s5 N900T.

I am not certain but I thought I read that the boot loader is locked on n900A -ATT and not so on Tmobile version and also that N900T has an extra LTE band.. I didn't double check on all of this but based on what I read, I felt that it was better to buy N900T, even for AT&T.

Those of you, in the same predictament - just buy N900T!