I did a comparison in my 125, used a bottle of both DT's and PF, used the DT's til the bottle was empty waited a few weeks and used a bottle of PF, used the recomended dose.
I saw no improvements with DT's, I did notice a difference with the PF. First, the pod population exploded, then more filter feeding worms started opening during the day and my coral's PE was improved.
I still use the PF even though everyone seems to be jumping on the DT's bandwagon. I'm only relaying my experiences, not claiming 1 is better than the other, I don't know enough about it.
I also will use a bottle of reef solution every month or so.
I have tried the oyster eggs and still don't get it????????
Just my 2 cents, fwiw.