Without a doubt, Serious Seeds are the best genetics available to the general public. I know there are those that are AS good but IMHO, you can't get better than Serious Seeds. I have grown 4 of their 5 strains.
My order is like this...
1. Kali Mist - The absolute best plant that I have ever grown. I have probably made more posts about Kali Mist than any other strain. She is a beauty. Although she can be tempermental from time to time, she is easy to grow and a pleasure to smoke. Her high is "one of a kind"...She has a fragrance that is sorta spicy but intoxicating and a flavor that is just as unique. I am currently on my 4th grow of Kali Mist and she just keeps getting better. I still don't have her dialed in yet but in spite of ME, she continues to spit out huge, resin coated buds. The high is very long lasting and has no ceiling. The more you smoke the higher you get. Its a "thinking mans" high. On a side note...women absolutely flock to the stuff like a moth to a flame. Once they get a taste of Kali, they will follow you around like a puppy dog. I can't explain it, I just roll with it.
You know how you can get a good hybrid or some couchlock indica and after awhile, you don't get any higher? Well, Kali Mist will just keep on raising the bar. I have had friends actually say they believe you could OD on the stuff.
Once you smoke Kali Mist, you will judge cannabis in a whole new light.
2. White Russian - Like all serious strains, this one grows huge, huge buds. It can take pretty much everything you throw at it. Very nute friendly and will produce regardless of what you throw at it. At the time I grew it, I had no experience but it was the best meds I had grown. The high will knock you on your ass. I am serious (no pun) this stuff will take your legs out from under you faster than you realize. The smell is very pungent and you better have some good odor control when you grow this beauty. At the time, I wasn't taking clones so like a dumbass I did not get to grow it but one time. I still have some beans and I will grow this again.
3. Ak-47 - The AK pheno I had was a bit harder to grow than I had hoped. It may have been my temps being a lil high (85 degrees) but the girls I had was a constant struggle. Even with the issues I had, I still got about 3 OZ's off of 2 plants. This one was a "stinker" as well and it was the reason I learned more about odor control.
The buds were very thick and resin coated. The high was a fun type of high...one that allows you to enjoy time with friends without the bleeding eyes and slobber running out of your mouth. This was NOT a one hit quitter like advertised but it was a long lasting high that never got old. The taste was a bit of a let down to me but again, It was early on in my growing career so I have no doubts I could do better if I ran this gear again...and I will.
4. Chronic - This plant starts out growing buds. I have never grown a plant that grew as many buds or as big a buds as Chronic. If I was ever going to grow to sell, this would be the strain I would choose. It clones easy...grows easy...produces huge yields...great bag appeal...a very narcotic stone that will get your attention fast. I grow in 4 gal buckets and I swear, the root ball from chronic was nothing but roots. I don't know what happened to the dirt but when I looked at the roots they were everywhere. Again, this is Serious Seeds and the type of genetics you get. All their plants produce roots like no other.
Sorry about the long post but I may not know much about growing but I do have alot of hands on experience with Serious Seeds gear. You will get consistant plants from everyone of their strains. Anytime someone tries Serious Seeds gear, it seems like they ALWAYS rave about them. You can't go wrong with any of the strains but if I had to choose just one, it would be easily KALI MIST!
Here are a few pics of my Kali at 35-42 days. Also, go check out Bonemans journal on his Kali Mist grow. That guy has some skills. Good luck and remember, you can't go wrong with any of Serious Seeds gear.