Producer as far as flavor, potency, yield?
The topanga is at the top of my list. It is just super strong, super green and is LOUD. Chem 4 is a good one but the GMO in my opinion is stronger. Its chem D and girl scout cookies. Its loud as all get out and yields big. The purple punch is very good also. The flavor and smell is the most unique I've ever been around. Truthfully If I had to pick 3 I could not live without, it would be GMO , Topanga Canyon, and the Purple Punch. All of the strains are good honestly, but some just stand out in there own way.
I personally preferred the topanga crosses over the punch , but majority of people want punch so it is not up to me. My opinion the topanga x Gmo would create the next best thing. Both moms are true powerhouses. Vigor, potency, everything is off the charts.
As far as regs go the stardawg Corey and stardawg Male together made some rediculous offspring. There was issue that kept him from making those seeds in bulk but they are coming early spring for sure. The Corey is a very nice one IMO. I like it better than the chem4.. I can answer the questions best as I can but heisen is super busy and it's hard to get a straight answer from him sometimes so I fill in the best i can.