We use a thetford porta pottie if the CG does not have modern facilities or the facilities are too far for wife to trek at night. I'm not sure I would ever choose a vault toilet over a modern porta pottie. There's virtually no odor, mess or fuss with these thetford units... We do have a cabinet just beside the doorway inside the A frame for the thetford, but if conditions warrant it, we have a practically self-setting shower tent to use for the toilet as well.
Despite the nostalgia factor, I don't find charm in open pit toilets of any type. And I've never encountered one I would call either odorless or sanitary when compared to a modern appliance I know the full history of.
When we tented we had no choice but to use the pit facilities, but it's a tremendous upgrade to have your own appliance for that purpose. 99.9% if the time it's for her and it's for #1... There are usually opportunities to find a suitable modern spot for #2 as we do not currently do any long term boondocking away from all civilization as yet.
The thetford, based on our experience, does not develop odor over several days and is easy and clean to dump at a dump station or even back at home if needed.