Not a lot of difference tripster - decide on which way suits your financial priorities.
If you go finance and Franky or Tosh won't lend to you interest free then a bank is usually cheaper than finance "provided" through the garage.
Tho' sometimes there is a better deal to be had from the manufacturer if going brand new. But weigh these options against the best deal for cash.
iam hunting around the back of the settee now to come up with the money for trippy.
malc,my van was brought though the garage finance,and it was between 15/30 pounds amonth LESS than the high street bank,
there was a couple of loans cheaper on the internet,by £10 a month,but when i applied for one i got turned down,witha very good credit rating.