you have asked me ton give you my opinion on which sport you should choose, rugby or snowboarding. They are both thrilling sports. Rugby is very exciting and it isn't expensive to play, but it can be dangerous. you can easily get hurt. Snowboarding is a more challenging sport,but it's very expensive. There is a lot of equipment to buy like a board,special clothes and goggles.
To me, both sports are exciting. You should choose the one that you like the most.
Hope i have been of some help.
Good luck,
Mike