None are good value. Featured uncollected 300 unit give you the best chance at good champs, but its still too low imo. Best spend them on energy, masteries and revives.
As tempting as they look, they are not worth it. Yeah, people might get lucky but that's all RNG. There are better things to spend units on (masteries, energy refills, or revives/potions for LOL/story content) They look tempting to buy, but the chance to get something good is extremely low.
IF you decided already you are going to buy crystals in this game, go for the featured grandmaster crystals. They have better odds per unit for 5* champions over the regular grandmaster crystal. There is pretty much no point in the game that you should be buying premium or premium feature crystals, as Uncollected is easy to get and you’ll be getting tons more 4* from feature grandmaster.
Comments
short answer: none.
Ok but how much did you spend bro
Drop rates are too low to justify the cost. Only buy energy refills and revives with mine.