Well that price at Best buy could seal the deal. My only concern is looking at the bands listed on Best buy's site the unlocked version doesn't have band 71 for T-Mobile.
Anybody know how LG is with updates on their unlocked devices?
The unlocked versions work fine on T-Mobile, I've never experienced any problems using LG's unlocked phones on T-Mobile. The problem is no T-Mobile default features like WiFi calling... if that isn't important then you're fine.
BTW unlocked phones are the absolute worst for updates... carrier phones gets updates faster and unlocked versions often get abandoned.. they still get updates but it's very slow and infrequent. So if that's a problem too, then get the T-Mobile version.
The T-Mobile version is much cheaper than unlocked if you purchase it second hand off someone else. Just make sure the IMEI is clear and has no unpaid balance due on the device.