... I have played many of them including Srixon U45, Adams DHY, Wilson FG Tour, Exotics Tungsten Pro, TaylorMade UDi, Mizuno Fli Hi, Cobra King Utility and Exotics CBX Iron Wood.
The Cobra King Utility is the most versatile. I think it is definitely the best all around DI if you want to play it from the fairway and it is long off the tee. The Wilson FG Tour is a close second in this regard.
The Exotics are the longest by a few yards. I am just not a fan of the look at address of ether. Marginal but playable from the fairway with the exception of the *17 CBX-IW with the HZRDUS Black shaft that produces a very low trajectory but ideal for links style courses with hard fast fairway.
The UDi is almost as long as the Exotics and depending on loft they are playable from the fairway. Probably my favorite when all things are considered including look at address, playability from tee and fairway, and forgiveness. I have played the 3, 4 and 5.
If you can get past the looks of the DHY, it is also a very versatile performer and silly cheap if you can find one.
The U45 and Fli Hi are both just very good, solid performers across the board but I prefer all of the above as they each do something better than these two.