umobile have faster internet  but sometimes during night very slow especially at congested area, but calling umobile enjoy super low rate and even free call 1 hour per day b4 7pm is really attractive, and sure enjoy 5% discount on top up or bill payment with me 
xox always enjoy best call rate but the internet speed steady <>800kbps like that, not going too fast, but sure this 1 no special discount la since i m not that big dealer in this

comparison done, suggestion = try umobile first , if really not good in ur area, port to xox next time    both i can help

by the way maxis SKMM broadband sims can't conver to any plan, can't mnp out also as i know, u give up the number la