I got the SA-CD and I won't be getting the DVD-A ever. I think you should get whichever you suspect your player/s will play better. You ought to have some idea about that.
While I fail to see the need to own two hi-res formats of the same recording, it is not always so cut and dried as to which format is better played by your player. Mine is pretty much a dead heat with each format (borrowed an SACD of Beck's Sea Change to compare to my DVD-A). On the rare occasions I want something that is in both formats, I go with the less expensive of the two.
I have two DVD players. One plays DVD-A & SACD and the other only plays DVD-A. I bought the DVD-A version... It sound great by the way. I doubt there is much audible difference between the two.