When I first started I could only ever spin one way.
Now I can do it both ways perfectly fine.
When I done a side hop I use to side hop to the left, even though I'm left footed. Which yes, meant that my pedal hit the wall on the way up sometimes.
However I could side hop high anyway, and I when I went Dual Disc I practiced side hopping to the right. Shockingly, I could do it straight away, and after 2 weeks of hardcore side hopping practice I can now side hop even higher and much easier than what I could to the left.
This has also helped me being able to sidehop both ways. I am the only one of my mates that can sidehop both ways to a decent height, which is good for me
When we set out sections on the rocks, with the odd sidehop or pick I can do both ways, which is to an advantage.
It is better to learn both ways, sometimes you can see the pros do stuff one way, then another time the other way, although most the time they just spin around and do it the way that they can do it best.
IMO, learn it both ways if you can be bothered to - Helped me alot, specially in comps.