I've been on T-Mo for 3 years. Previously VzW and AT&T.
VzW is better in many places.
But I have no complaints about T-Mo coverage in NYC and LI.
Where there isn't any, I use the WiFi calling/data with no issues.
I can't imagine T-Mo wouldn't be better than Sprint.
"Their stupidity does not amaze me, its when they're smart that amazes me." - Zappa
Device: HTC One, T-Mobile (US) S-Off
CID: T-MOB010 (PN0713000)
ROM: ViperOne 5.8
Recovery: TWRP 220.127.116.11
Previous Infestations HTC Sensation
ELEGANCIA 4.1 v3.5
Bricked 3 v1.4 lagfree
OpenSense (fave, wish dev cont'd)