My two year on the Nexus S on sprint is coming to an end soon. So you recommend just buying the 4 directly and that will resolve the updating issues (Sprint was

My two year on the Nexus S on sprint is coming to an end soon. So you recommend just buying the 4 directly and that will resolve the updating issues (Sprint was always behind the other major carriers due to 4G or something similar. I'd wait 2 - 3 months post major announcement)