Well I have both the Diamond wood rack and the Delta 13 Elite with inserts. I have used both but prefer the Delta it has always given me a good rack. It being made of metal is a major plus in my book. I have played with a lot of older racks including Diamond wooden racks that seem to have over time changed their inside shape from continued use and you had to rack them with a particular corner of the rack on the spot to get a tight rack. Wood seems to also tend to get loose over time as well.
JMHO
The Diamond Wood rack is no where near the quality of the Wood Works rack, but it looks pretty. It's heavy bulky and too complex and has an inly that does what?, plus if you've got a GC it doesn't hang below the ball box. Too much wood IMHO.