OP How much do you weigh?
I weigh 175lbs and ride a 157 proto here in Japan (Nozawa). Whilst the T.rice is sure to be stiffer thats not always better IMO.
I ride the same kind of stuff, mostly powder, trees, natural hits throwing spins (360s 180s) and grabs.
At my weight its still stiff enough for aggressive riding, has great float and stability on landings. I love it.
I also love riding switch in the powder and being able to spin and land switch off natural hits.
Of course a twin won't float in the super deep and over about 40-50cm of fresh (depends on the weight of the powder) I will reach for a pow specific board.
I used to ride a very stiff ride highlife, but I really like the softer feel of the proto. Its mid flex, but you can flex it in a way that helps you turn faster in steep deep tree runs. Also just more all round fun than a super stiff board.
If you weigh much more than me it might be too flexy for you.
The T.rice is by all accounts much stiffer if thats what you want. The proto is just stiff enough for me and it does float very well in the Japanese powder.
Here it is in action.