If you want to learn to strike in Dubai, boxing and Muay Thai are the two obvious doors. Both are excellent. The right one for you depends mostly on how much you want to learn at once and what you're after.
Boxing: simpler, faster to feel competent
Boxing is hands only — jab, cross, hook, uppercut — plus footwork and head movement. Because the toolkit is smaller, beginners feel competent faster, and the defensive skills (slipping, rolling) are some of the most useful things you can own. It's a brilliant first striking art and a phenomenal workout.
Muay Thai: more complete, more to learn
Muay Thai adds elbows, knees, shins and the clinch — "the art of eight limbs." There's more to absorb, so the early learning curve is a little steeper, but you end up with a far more complete striking arsenal and serious conditioning.
How to choose
If you want the gentlest on-ramp and razor-sharp hands and defense, start with boxing. If you want the most complete striking and don't mind a busier first month, start with Muay Thai. For fitness and fat loss, both are outstanding — it comes down to which you'll enjoy enough to keep doing.
Or train both, in context
At DKing Combat System, coached by DKing Saad in Al Quoz, boxing and Muay Thai are both striking modules inside one real-world system, so the hands of boxing and the full weapons of Muay Thai reinforce each other — and feed into genuine self-defense rather than staying sport-only.