I also have a walnut dash and a wheel as per picture 2; ie with the slots, which I like for both looks and feel.
As for slots or holes; I went for slots a decision not entirely un-connected with seeing a friend (who will remain nameless) sat in his car with his finger temporarily stuck in one of the holes of the wheel on his 4/4
This would be bad enough, but he had just parked on the ferry deck, en route to Le Mans in 2006. We never remind him of the incident!!!
Bud