Practically speaking, many camper vans offer less day-to-day living space & something that is often overlooked is the available standing room, once the bed is made up.
Many campervans leave no room for standing, so once the bed is made, you'll be making the coffee on your knees & pulling your jeans on laying down! Certainly not great for the back, especially on longer trips.
Go-Pods provide a convenient standing area, even when the bed is made up. You can cook a meal, make a hot drink & get dressed - all while standing comfortably. Even the loo can be used inside - making all the difference when you're actually travelling.
From a comfort perspective, many campervan’s rock n' roll style beds can be bumpy & small. Compare this to the Go-Pod's large, flat, king size bed platform, complete with it's 10cm foam mattress for a proper nights sleep!