the rig on the left will have more a bunch more opportunity for uptravel.
So maybe that's what this boils down to, is prioritizing uptravel vs belly height. The subrame rig could match the flat belly rig in uptravel and have similar COG at the cost of a lower belly height, or match belly height with more uptravel at the cost of higher COG.
They told us a few pages ago all you need for rock crawling is 3-4" of uptravel. So if that's true, they'd be talking out of both sides of their mouths.