A fixed bed and a dinette system are just two out of many options you have for the layout of your van. Here are some of each system's pros and cons.
1. More storage.
2. More comfort with a real mattress.
3. Less hassle.
1. Needing a table. You would need to find an alternative working set up when you're working inside the van.
2. Less space for guests.
3. Less open space.
1. The impression of space.
2. A welcoming living room.
3. An epic work station.
1. Less storage.
2. Sectional mattresses.
3. More hassle.
If your priorities are comfort and storage, a fixed bed would be more suited for your needs. If you want space for guests and a work station, then a dinette would be the better option. Remember, at the end of the day, what system you choose still depends on your needs. Evaluate your needs well before settling on a system for your van. Vanlife is tricky and it involves a lot of compromise on your end to be more efficient and mobile, so reconsider what your non-negotiables are when it comes to sleeping quarters.