"Al-Ahli" & "Belhasa", both are good. Al-Ahli has best passing rate as of now.
1. If you've good control on driving and you follow all the rules whatever driving school will teach you, then you'll get your license in 1st/2nd attempt.
- If you hold valid PK license more than 1 year old then it will reduce the number of training classes. If you don't hold an old license then you'll have to take minimum 40 classes, means more $ going out of pocket.
I got both Driving (M/T) & Riding License from Dubai, got both in 1st attempt (Alhamdolillah). Spent 5k aed on Driving License and around 4k aed on Riding license as didn't had any previous valid license. So, having old license will save your money n time.
Following thread would help if anyone is interested in getting Motor-Bike license from Dubai.
https://www.pakwheels.com/forums/news-articles-driver-education-safety/186407-motor-bike-lessons-license-dubai-4
(PS: RTA rules keep on changing from time-to-time. Procedure in above thread might have changed by now)