I would/will be undecided between those two options!
PXS would give full worldwide coverage. And I believe we will see cdma and gsm for at least one (possibly two?) decades.
On the other hand LTE is the future (but what I see here in Germany about umts coverage I get a lot of time only 2g, even in the city).
So what, do you want the Neo as up-to-date crazy-fast-dataspeed smart phone? Or as an overall driver?