I'd prefer a stronger 3G network than a faster one. Alot of times I don't get any data flows even though I'm showing 2-3 bars. And I bet with LTE, things will remain the same in terms of signal strength.
If it ends up being LTE 3gb capped or 3G unlimited, I will probably go the latter route.
3G is already capped (throttled) at 3gb with the unlimited plan. LTE is capped (throttled) at 5gb with unlimited data, so you really benefit more from LTE plans.