TLemelinDetailed reasons why SA300 is better imo:
The USB on the AD18 is problematic. So I had to use optical on that. BT was also terrible.
The SA300 has great USB and BT works properly. Also, RCA sub out is a huge plus as opposed to 3.5 sub out on AD18.
Literally the only think on the ad18 worth considering is the optical in in my opinion. Even the headphone amp is mediocre.