The problem seems to be that most people buying Nirvana think they are getting the exact same thing that everyone else charges more for. No point in arguing becuase they will argue till they are blue in the face.
Serious Seeds is all I mess with anymore, I get good quality, good phenos everytime, so they may cost more but I know what I'm getting everytime. You may need 3 packs of Nirvana to get a good pheno, but hey it still costs the same as one pack of serious seeds, right ? It boils down to time, do you want to grow 30 plants to find one good one or 10 plants to find one good one ?
Then you have people that claim to get good phenos from nirvana out of every pack.
It just boils down to everyone wants what they use to be the best and will argue and make up facts trying to support it and convince others what they use is the best.
I've used both and I'm sticking with serious seeds, you can call me dumb and tell me I'm wasting my money but I know what to expect everytime and everytime I smoke with anyone they are blown away. What else can I ask for ? Then you'll get some one who like nirvana get one here and preach that they bought some AK48's and they grew 16 foot tall and yielded 8 pounds of bud and was the best stuff they have ever had.
Basically most people are going to BS some about the brand they prefer, try them both and see what you lke the best. I bet in blind test and you didn't know which was which and you didn't pay for it, I bet I know which one you'd pick.
That's my opinion, no need to get in a big argument over it after all we are supposed to be family on this site.
Peace my brothers........