Id say,
1 Royal Queen seeds- Blue Mystic(superior to nirvana's)
2 Nirvana -PPP, Papaya, Bubblelicious etc
3 Flying Dutchman seeds(not listed)- Pot of Gold, Pineapple Punch, The Pure
I wouldn't waste my money on Dinafem, Dutch Passion or Barney's Farm
I think the best comparison to make, would be to buy a pack of Nirvana's Sour Diesel, and a pack of RQS sour Diesel and grow them out and compare. They both say say sell the same stuff, I trust nirvana with sativas more than I do with their indica varieties personally. They once had a solid stable of quality sativas back in the day, recently they've discontinued a few of their old sativa strains, and appeared to have solidified around a fewer strains now, which might be a good thing as far as maintaining quality is concerned.
