Hi Bob, My expectation is that celcom wireless bb should be better than Digi, since Digi uses Edge (not 3G) speed is limited, while Celcom uses 3G and coverage might be better. Outstation might be less congested than in the Klang Valley. Hope it goes well for your testing.
Good thing about Celcom is you can opt for daily usage (at a rate of RM3/day at a reduced speed)... Others is on at least a committed basis for 1 yr, changed monthly.

P1 speed good but might be limited in accesibility esp outstation.
Assume you have 3G h/p for the celcom wireless bb (so, no need to buy modem - extra cost).