Honestly as far as back support I'd go w/the Get Out. That being said, I'm not really a trekking pole kinda of guy unless the hike/terrain kind of forces me into it...I'd rather have my hands free, in many cases.
I use the TrekChair when I am using my free standing tents or on day hikes that require trekking poles. It really is a comfortable chair and you may want to check it out!
This was a clip from the ATKO video. Wanted to make this video separate and shorter for those who may not have watched the whole ATKO video. Get out gear is GREAT!