There are several strains that are on the market that are highly regarded for their potency, not solely for the THC percentage, but also for the total cannabinoid content. It depends on what type of strain you are looking for and if you prefer indica dominant strains or sativa dominant strains. For sativa dominant strains, Melonade (Watermelon Zkittlez x Lemon Tree) cultivated by Alien Labs would be one of the most potent sativas, Lemon Meringue Cake (Wedding Cake x Lemon Tree) cultivated by Your Highness LA, along with Lemon Tree, as well Tangie crosses, such as Sour Tangie (Sour Diesel x Tangie), Tangimal Cookies (Animal Cookies x Tangie). If you prefer indica dominant strains, my go to strains would be Girl Scout Cookies (OG Kush x F1 Durban Poison), Sunset Sherbert (Pink Panties x GSC) cultivated by Sherbinski, Gelato (GSC x Sunset Sherbert) cultivated by Sherbinski and Alien Labs, Biscotti (Gelato #25 x South Florida OG) cultivated by Alien Labs, as well as Billy Kimber OG which is regarded as one of the most potent strains on the market, with certain batches testing over 30% THCA. I hope this answers your question!