Just my opinion but I prefer a stand up to a sit down any day. I have a HQ Avante on a 10 foot frame and am very happy with it. It actually came with a 12' frame but we had to downsize it due to space restrictions. I find it plenty big enough. I know I will never make anything more than 96" and use my longarm for personal use only, no business.
I agree that it's easier to move the machine than it is to move the fabric.
Good luck with your decision.