I use Project Fi and have been pretty pleased with it. I switched from iOS and it took a little bit to get used to Android, but I do like the Pixel just fine.

I've generally gotten better speeds internationally than t-mobile, but service in China has been very poor, and due to the Great Firewall you can't use wifi for any google serivces (problematic on an Android).

Domestically I have no problems with signal/reception (I do live in a city). If you have Comcast/Xfinity you can set it up to always log onto any xfinity wifi router which saves on data usage. Not sure if other companies do this. The phone also automatically logs onto known public wifi networks. This has kept my phone bills under $40 a month.