If you look into the design, they are typical buggy design with the difference of typical steering mechanism.
If you look into the craftmanship, then X car is better.
If you look into the durability, then M car is better.
If you look into after market option availability, then M car is a bit more.
If you look into the price about whatever, then M car is in this advantage.
If you lokk into the performance, then see who and how the driver is