Obv skiers think skiing is better, boarders think boarding is better. But the real differences as to which one is “better”, or more suited to you, only really become appaerent when you reach a very high level I would say.
I’m a ski instructor and I know people that do both..
In skiing you probably have more control going down narrow steep chutes than boarding, with shorter turn ability and the poles to help swing around…
Also boarding you’re screwed if you run out of speed on a flat section.
I prefer skiing, it all depends.