Nice logic and well explained. Thanks. We are lucky to have a forum like this where we can openly exchange views and evaluate the strengths and weaknesses of various brands.Just my personal opinion and my thinking. I really like the Mission and as I said, I put money down on one and was a few days from driving to pick it up.
I spent some time on the fakebook page of Mission Overland. I kept seeing issues with leaking (quite a bit actually), general quality issues, rips on the fabric, other misc. stuff. The group is considerably smaller than OGT, roughly 20x smaller. It seems that MO is always trying to fix something or another. That being said, OGT has issues too. But when I compared the relative difference in complaints and bellyaching, it just appeared to me that OGT might be farther along in quality. I think MO will get there. I love the design.
Mostly however it was how the Expo is set up. Storage is really great, and in fact we have extra space. I like the kitchen setup for the Expo which helps lower the tongue weight relative the the MO. Note also I think the MO is heavier and I wanted a lighter load on both our JLU, and our JT.
The awning on the MO is superior in my opinion to the 23zero, so when OGT ran out of inventory, I bought the OVS 270 which the MO comes with. I also bought a CVS awning for the driver side that has a tent system. That was to "replace" the MO advantage of a pop up roof and a hangout space from bugs. The last camping trip, we put the OVS awning walls on, and had a nice gas fire inside, and six of us around the fire. What awesome memories.
And finally, since we also carry kayaks, I wanted to be able to have kayaks on the roof but still be able to camp if it is an intermediate stop. I just set up as normal, but leave the kayaks on the roof.
All in all, it is a tough choice and I could have been happy with either. If you like the MO, you should get it, but I prefer and am glad we got the Expo, it is such a nice rig. Hope this helps in some way.
P.S. One more thing, I think the Expo is a bit warmer in cold weather than the Summit.
From what I can see both companies have great ideas and good builds. OGT has a formidable social media presence and with their Facebook group especially, they have built strong brand loyalty. Mark from Mission Overland, has built a lot of credibility on this forum by his willingness to help other enthusiasts and his solid technical responses to questions.