Im using both lines. Tbh unifi coverage is so bad. The last time went to Perak, Penang had really bad coverage in half of the areas I visited. Even in the middle of Damansara Unifi put misery in my life. Say no more for Unifi

For Celcom the line coverage is great. Most of the places can reach(Perak,Penang, Johor, and Selangor). For 5g my Celcom can reach 1.2gb so for now I am satisfied with Celcom coverage