I agree the more open floor plan gives you more options and does allow more toys to be hauled. We considered that type of floor plan very closely.
We did opt to get a plan with a separate garage however, and one advantage there is the gas smell is not in your main living area. I often do not unload the ATV when returning from a hunting trip until days later and be have the separate room the oder is not an issue.
The other thing we like is when another couple joins us, it is like a separate sleeping quarters with lots of privacy. Our needs may be different than yours but this has worked well for us.