Timba,
I have an 8" Hunter on my Patriot Dually and my buddy Frank has a 6" on his Patriot Dually.
We are both shooting fairly light Copper John " Dead Nuts" sights, and truth be told Franks has a little better neutral balance........his doesn' t tip forward or backward when held for balance and holds very nicely.
I chose the 8" because I like just a bit more more mass weight and length for added stability at the shot.........for me I get just a slow forward tumble. Nothing pronounced. (I like a 12" for my 3D bow)
A stabilizer IMO should do exactly what the name implies.........STABILIZE your bow before during and after the shot. They should perform more of a function than just a noise/vibration accessory.
Both perform better than anything I' ve tried with regards to noise, vibration reduction..........but they also stabilize your aim, and reduce recoil after the arrow is gone. They really tame these high performance bows, and they love Dual, and Cam and Half/ CPS style cam systems.

Its easy to recommend these from a performance standpoint, but balance and feel is a personal thing........my advice is (since I do have experience with that exact model) if you want a " neutral balance" the 6" will probably be better when used with most average sight and rest choices.
If you like a bit more heft and aiming stability the 8" might be a better choice.
One nice thing built in to think about as well..........these stabilizers are dual chambered and the weight distribution is 60/40 with the 60 out front. If you find the model you chose to be a little too heavy out front, you can swap the stud to the front and and use it backwards, bringing the majority of the weight tighter to the riser.

Stealth stabilizers are as good as it gets IMO performance wise.........the trick is just finding the right length and weight to suit your tastes. I hope this helps.