Which one is better, streamer pro or DL III?


I have a 27" i7 iMac and Dynaudio BM5A II speakers and look for a DAC. Which one is better, HRT music streamer Pro or PS Audio DL III? I heard usb part of PS audio DL III is not that good. How about its Toslink input with iMac comparing with streamer Pro?

If you think something else at same price range is better, please suggest.

Thanks.
wqdeng
Toslink through any DAC will not sound as good as asychronous USB through the HRT DAC. FWIW, I'm using a HRT Musicstreamer II+ from my MacBook Pro and find it sounds excellent.
Sorry but the toslink vs. USB statement above is an opinion, not a fact.

Out of a Mac, a glass toslink like Van Ven Hul Optocoupler into many Dacs sounds as good...sometimes better, than USB.

Having owned many dacs and tried both approaches, I find comments that denigrate toslink to be entertaining but not entirely accurate.
Always happy to challenge blanket statements that infer that those in disagreement are less enlightened. I stated my opinion based on experience with many Dacs- including the one you own. You seem offended that I challenged your statement and I meant no offense.