Can you post a link? As far as I know both UBEC and also SBEC are separate units (U stands for universal, S for switching) and they are use with OPTO ESC or for larger power than integrated BEC can supply. If it is so, you have to chosse better ESC with integrated BEC. All our timers use so little power, that you not need to worry about type of BEC, just check voltage, as some timers can be designed for 5V and som BEC can be even for 6-7V.
If you have really UBEC or SBEC intergated ON THE ESC, then again, both will work well, but linerar (non switching) BEC costs less and it is also better because of smooth voltage.