I think it really just depends on how you’re planning to use the van.
Pop-top is great if you still want to use it as a daily driver. You can get into most car parks and it feels more like a normal van, plus the extra bed up top is a bonus. Downsides are you’ve got to put it up every time, and it’s not the warmest or quietest in bad weather.
High-top is the opposite really — way more comfortable if you’re spending a lot of time in the van. You’ve got proper standing room all the time and more storage, which makes a big difference on longer trips. But yeah, you do notice the extra height when driving or parking.
If it’s mainly weekends and shorter trips, I’d go pop-top. If you’re thinking longer trips or loads of time in the van, high-top probably makes more sense