I would run both of them if you can. You will be able to see which is better. I personally don't think that there is much difference.
Are you strapped for room? If not, keep the pump on the outside and use the body of the skimmer for the air to bond with the organics in the chamber. Why the internal pump skimmer?
Sedra pumps were the standard and still to a point, IMO. Red Dragon is a better skimmer pump at quite a higher cost. The DC diablo that I have is not great, but I think that the 12" octopus body has too big of a neck - so I am not giving up. Atman is a Sedra rip off... so is Sicce, but the sicce is quieter. The venturi and impeller are basically the same for all of these except for the red dragon.
A similar body is going to be about the same with the same neck size, height and chamber diameter. The ones with the pump inside will have less reaction chamber and time.
The meshmod is kinda a waste of time... mine never performed any better with them, but others might disagree. I have some Enkamat if you want to try it, but they don't last as long as the standard needle, IMO, and are not worth the trouble. I think that you can do more by widening the hose barb on the venturi a milimemter, or whatever, with a drill bit.
Too much air, water or too fine of bubbles are not effective, so be careful of any of these.
