I have a 3i, the old hex hub fatfish 6120i, and and am waiting on an outbreak 850xd to ship when it gets in stock. It really depends on your fishing style, the 3i I won’t fish 2 in, but I’m also 6’4, I use it early/late ice when I’m dragging, or if I’m just gonna be out a couple hours or want to move around a bit. All the gear stays outside except the necessities. The 6120 has been my all day sit, 2-3 guys, not moving around rig, I HAVE dragged it out, but prefer not. I ice camp in it, and have slept 2 on shore for spring opener. I think it’s the ideal size for 2, not on top of each other, can bring your gear in out of the cold, stand up if you need to stretch etc. I’m not sure they make it anymore so I think the 949i is the closest equivalent. The 850 is just because, the one flaw of the 6120 is the doors, and I think with the double dome it’ll be a nicer camping set up. I’m of the mindset bigger is better with hubs, you never REALLY want to move much once it’s up, if you did you’d have a flip over. Most folks I fish with do their moving outside, and use the hub as “base camp”, so why not make that base as comfortable as possible?