The best is not possible to tell you because you do not tell your preference. I am a big fan for the old skool cannabis so I like to grow Sensi Seeds, most people these days prefer the american new strains so they like to grow new strains from Ethos.
In my opinion you should not ask this question because the answers will be useless. Do some research on this website and check what strain is your best choice in taste, effect, flowering phase, yield, difficulty to grow and many more.
If you want my advice I really do like the red strains from fastbuds because they are sweet and look great.
Happy Growing buddy!