That is a really difficult comparison to try to do! There aren't any bands really like them. They can take a while to get 'used' to, but it is worth it.
If you have ever heard VDDG's Theme One, the rest of their music is not like it at all! Very English, very early-mid 70s prog, quirky, with a jazz influence in places, can be gloomy, can be uplifting, quite 'intense'. The nearest I can come to them is a sort of Caravan meets Soft Machine meets Hatfield And The North, with a strong element of singer-songwriter poetry. I never really got into them until I was into my early 20s, then something clicked, I think my musical tastes broadened a bit more and I added them to my already rather eclectic collection.
One of the Guys on my Uni course was fanatical about VDDG, and I mean fanatical, I'm not sure he ever listened to anything but! Before the end of the first year he'd vanished and joined the Moonies (a very dodgy religious sect), at the beginning of our final year he reappeared begging us to hide him from the Moonies
we had to chase sect members out of our main Uni building!