The real question is what kinds of tones do you like in a guitar?
The DGT is a more vintage sounding axe, and the CU24 more modern.
For what it's worth, in contrast to Alan, I never bonded with the original T&Bs on the Customs I owned back in the day, and much prefer the 59/09s or 57/08s. The PRS website says that the CU24 is available with a choice of pickups, not just one as implied in the previous post.
Internet advice on what to buy is never all that useful without some context, so here's mine:
My PRSes are used for recording tracks for TV ads composed in a wide variety of styles. While I sometimes play high gain stuff as needed for a track, I prefer moderate gain and more vintage sounding tones. I get my overdrive from the amp, as opposed to pedals. My amp is a PRS HX/DA.
For my purposes, the DGT would be a more useful guitar, however, everyone has different needs and preferences. I'd say play both and see.