There are a few differences between the two options
spirit of the 50's
Goes right up to the window with cutouts for your wiper spindles
Two vinyl covered metal tabs at each side (bottom and middle) that bend round the front panel to hold it in place
Webbing strap at the top that goes into the van stretched across the dash board
Lined on the inside
Vunderbra
Doesn't go right upto windscreen - stops just below wiper spindles
Three vinyl covered metal tabs at each side
Not lined on the inside
I think that's all correct but correct me if i'm wrong............ i'm basing it on my spirit one and my mates vunderbra
To me that means the 'spirit' one gives better coverage and is more secure (less easy to steal) but both the wiper cut outs and the webbing strap means it's more of a pain to put on/take off than the volksheaven version.
You pays your money and takes your choice, personally i've got a 'spirit' one in colours to match the van
Be aware that if you go for colours rather than B+W the price goes up, as it does if you go for smaller checks. Mine came in at about £180 i think