My left hand tends to be stronger and more coordinated than my right hand but my right leg is stronger than my left leg.

Guess I'm lopsided!
My Neurologist even commented on it last time I saw him. My right hand has been numb for several years. I can still use it but it's weaker and less agile than my left hand. My writing has gotten messier, too. I've tried using my left hand but that looks even worse!
I think even folks without MS or other neurological issues sometimes find that they favor one side over the other. Just stand to reason that the side used more often will be stronger than the other.