Priority? Never heard the term. but I assume you mean brand specific..So the answer is you can pretty much use any dies. I must admit I have used most brands on my Dillon in the past. I do feel that the Dillon dies are made to work on their progressives... and they do seem a little easier to work with. As stated by the previous poster the Lee needs a specific die or two. I run the LCC turret with a Lee 4 die set. I am not an elitist but I consider Lee dies to be somewhat poorly made. Personally despise the rubber O rings. The Lee Collet dies seem to work very well for rifle. I have seemed to have more troubles with Hornady.also