RE: MTS
In India it depends on mainly signal in your place of usage. Unless you test it in your place by calling for demo etc, don't buy any brand.
About speed both use standard speeds like 3.1 MBPS etc and both are in CDMA technology.
So you should check this:
- Real speed ( use speedtest.net for this)
- Continuous download - how long your device can remain connected to internet without redialing again. For long torrent downloads you don't want to restart every minute.
I've already had a horrible experience with Photon+ in Dehradun for more than a year - where there was no option in y2009.