Not much help as haven't bought from either, but was told by many people to avoid the second one so I did! As for DHI I did speak with them on the phone and they were very helpful, do produce some nice young horses and prices seemed reasonable, but I didn't go in the end due to distance. That's all I know, sorry!
Haven't brought from either, but rang DHI about one they had for sale and they were entirely honest about it as I was after an eventer sort and the chap said he didn't think it'd jump, and they were very helpful. I noticed a few eventers about with DHI prefixes now too.