doing unnatural 2s on to rails is easier to land, because you should be landing the way you naturally ride rails. For me, I have a lot of trouble doing unnatural spins on to rails, so I've gotten good at riding them unnatural.
but yeah, sometimes you don't spin the same way for different tricks. When I spin on axis, rightside is always more comfortable. But for rodeos, misties, flatspins etc I spin left, and I seem to be indifferent to corks (both ways feel natural, but I can only cork 3 rightside)
for people like you and I, it is a good idea to learn tricks spinning both ways.
learn tricks in whichever direction you feel most comfortable, then learn unnatural later.