Apeks higher build quality. Parts harder to come by unless you order from Europe or have a US LDS source. For DIY, instructions and diagrams are easily available. As noted, DR doesn't make this info easily available, so it's a bit of a stress unless you have prior rebuild experience.
Tho' Apeks seems to be headed toward wonkier plastic seconds, and has had a few HP seat problems over the years, the XTX200, with possibility to upgrade to the 5th port as needed is a clearly higher quality product. That makes it a slam dunk, IMO. Unless money is a factor...