Should I swap to skis?

I live in Japan and have been snowboarding for around 7 years and am confidently able to do a double diamond black. Last winter I got into snowboarding off peace(or the parts of a resort which aren’t a real track, ungroomed, full of trees, and very deep powder) and really enjoyed the experience, however I almost constantly got stuck in snow when snowboarding, and found it really hard to navigate in deep flat snow and will often get stuck, on the other hand my friend who was on skis had no problem. I use a rental board which might be the problem and maybe i need a powder board, or should I swap to skis if in the future I want to explore back country.