You need to do a land race comparison. One day smoke an Afgani, then the next day smoke a haze. Then the next day smoke a thai. Then smoke an old school hindu kush. Then finish it off on the last day with a hawiian. Any ways you will notice a difference in all of them. I have tried hundreds of strains, and found some of them to be very similar. This happens a lot in the world of comercial bud. There is some big indica, or skunk in almost everything made for commercial use. This is why they all seem the same. It takes smoking IBL pure land races to learn the true subtle differences.