I have an ID4 on order should be here in Feb/Mar. I tested both ID4 and the Enyaq. Whilst I found the Enyaq to have a few things over the ID4 like larger boot, nicer designed interior and slightly better range there was no Enyaq on the motability scheme. If I was buying with my own money I would just about choose the Enyaq but you have to be careful what extras you order as the base Enyaq whilst slightly lower in price than the base ID4 has absolutely nothing included. The VW even in basic guise has things like heated seats Sat Nav and heated steering wheel which cost quite a bit extra on the Enyaq.
This will be a big issue if the Enyaq makes it onto the scheme, as many “essentials” are extra and are paid for at full price, perhaps with a small % discount.