I have Sprint, but its all I've ever had. It's fine for me, but I probably don't live where you live.
If you are in NE, I have found some pockets (mainly rural) that don't get good Sprint coverage, where people I have been with that have non-Sprint have been good.
Also, Sprint for some reason doesn't work very good in the Planet Hollywood Casino in Vegas.
Where are you at Pedro? Back home in Nebraska, unless you don't venture outside of Lincoln/Omaha, they're not good. Down here in the DFW area, they're great until you go outside of the DFW Metroplex, then you hit problem spots.
If you are in NE, I have found some pockets (mainly rural) that don't get good Sprint coverage, where people I have been with that have non-Sprint have been good.
Also, Sprint for some reason doesn't work very good in the Planet Hollywood Casino in Vegas.