Mig,
If you can keep your balance respectable, I would go with the 120.
The H9 t-craft hits the scales at around 15 pounds. I have a g23 glow on mine......You have a simiular aircraft but lighter.
You can always throttle back. If your weight management is in the range of not having to put a boat anchor on the tail...I would go with the 120. I would even think about placing a larger fuel tank forward to manage the cg and weight .
The biggest dissapointment I have had with a plane is underpowered.
Good Luck,
DOC

how many planes you have! seems like you got em all

Shortman,
I have 22 that is flying. That is a small hanger for my age.
DOC
Sorry I went back and counted again...
Its 23.....smallest super stick 40......Largest 1/3 (Bradford) Laser.

how many do you need flying? i can see building them to just build.

Well Shortman,
There will be a time when you get tired of flying one...and you obtain another....then you see the new one that comes out.....then you buy one at a show.....then you trade one for two....then you ...well you get the idea.......You see I have 45 years on you....you will understand in time.
I am retired, I make good money, I had rather spend it on a good airplane than a woman...something you will have to learn in time.
Women are automatic.
Flying takes skill.
Good luck my friend.
DOC

no wife? no kids? hehe looks like you took life the smart and easy way

Going to put a Saito 100 in mine.

I love scale areobatics, that's why I'm going with the Saito 100. It's one fine engine with enough power to fly the Decathlon "scale like".

I will state without reservation....The Saito 100 is the best engine in my hanger..
Doc