Transformation masks wise, I actually like the goron mask as well as the Zora mask a lot more than others. Bunny hood forget about that, Goron rolling on land is much faster. One for powerful attacks, that could even break more stuff than the bomb mask, while having a good asisibility to the water with the Zora mask.
Not counting those, I would go with either the ummmmmm........ .... Why am I forgetting the mask name? I'll post this now til I remeber the mask's name. LOL
As a dork in love with another dork is it bad I would do the Sun/Moon masks? I just think it would be really cute gift or way to show love ;;
Usefulness-wise, I would def take the Zora mask. That way, I'd have no problems going into deep water or underwater, and I could swim so much better! Also, jumping like dolphins out of the water would be soooo much fun.