What features are you specifically looking for?
I have the dual sim international version G975F, I use TMobile and everything I need is working just fine. VoLTE, WiFi Calling, Visual Voicemail, etc.
The only thing I'm missing is LTE band 71, but it is of little consequence as that band isn't fully utilized yet as their still waiting for tv stations to give it up and it's mainly for rural areas.
I prefer unlocked versions as it is bad enough with all the uninstallable bloat Samsung puts in their phones ( ie, FB, Linkedin, Bixby, Samsung apps) I prefer not to add to the mix by also having carrier apps that I can't get rid of.
Also be careful with which model you buy from TMobile they have a bad habit of limiting the LTE Bands
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