depends la what type of music u listen to. get the type x if u listen to songs with more bass like hip hop or rock, etc. get the DDL if u listen to more musical stuff, instrumental, accoustic, classics, jazz, etc.
not to say the type x cant handle the instrumental part, just that the tweeter for the DDL seems to give more detail, but for me i feel a bit sharp-ish. also not to say the DDL mids cant play bass, just that i feel the type-x bass is more. aslo DDL easy to install, small magnet small frame compared to type X.