Sort:  

Hmm, I would say it depends. If you don't have many cards yet, I would definitely buy the draws, no matter which rarity you get. If you then play regularly and a lot, it can be smart to buy the rare cards with the Glint, as you get boxes from the leagues from which many common cards come. This is how you collect rare and common cards.

But basically I don't think you can do much wrong with the rare draws, as I said there are some good playable cards.