Not sure i agree as I run diff strains each time for variety! Key is just making sure you understand if some are short and some are tall, you need to deal with that i.e. stands for the small ones.
So let's answer the Q shall we? What is GOOD is more important than how well you grow! Grow mediocre genetics well it still sucks and vv.
So....
Wedding Cake, Gorilla Girl, Amnesia Haze, Dosidos, Critical Kush, Gelato OG, Bubba Kush, and Amnesia Number 7.
Wedding Cake...never met anybody who doesnt like it. Yes.
Gorilla gurl...im not a big gg fan, but most people are....yes.
Gelato is popular for flavor and contains cookies which many people like. Yes.
Amnesia Haze. Always fun, its just like it sounds when grown right...you forget sxxx lol.
Those are my choices. Dosidos for a 5th choice. I would go Gelato first though its a tastier version of a cookie strain and mixed.
How do I pick strains? I know most honestly but when searching I want:
Experience. I know from 30 years of experience.
Cup Winners. Key to understanding strains is MEDIOCRITY. most strains are mediocre. Growing mediocre is a waste! Now that doesnt mean it has to win cups to be good. Bur guess what? It has or will win cups if its that good.
High THC. Hate me, argue with me but in the end theres enough killer strains that if i grow it it has to have potential to be 20% or more. I wouldnt exclude something i really like, but can find enough with this characteristic.
High Yield. Not required, but it better yield at least medium, orherwise the work done is wasted unless you grow a lot of plants.
Summary: Experience, high thc, high yield and canabis cup wins are my criteria. I do not base my choices on how many weeks of flowering time, that variance is not important to me. I like a mix of indica and sativa characteristics for variety. If you groe one kind you have to know people to trade or you will get bored imo.