You really need to demo both Hobie's to find out which one is more comfortable.
Stability of the Outback is good, but not as good as the PA and the room factor difference is major.
I started off with an Outback for 3 years and then to a PA-14 almost 2 years ago......I am older than you, 6' and 172 lbs.....I have an inner ear issue so my balance is marginal....I have not had any "tipsy" issues with my PA-14 and it's simply by far easier to move around while in the water....just opening the front storage hatch on my old Outback was a pain.....my body is not as limber as it once was