I play both Hearthstone and Duelyst, I don’t think the two are mutually exclusive. I think Hearthstone feels a bit more casual, and Duelyst has a lot more room for strategy, making your personal skill matter a lot more than just having a good deck alone.
Duelyst is much more balanced than Hearthstone, which is constantly wracked with broken interactions and situations where you simply don’t have any power, no matter how good you are as a player. It’s all about the deck you run. The balance is a little off right now, just like any post-expansion, but it’s still being blown a little out of proportion.
Naturally there will always be top decks, and you will need to tech against them if you want to climb in the higher ranks, just like any game. But I’m happy to say that Duelyst supports a huge variance of deck types, and you can get to gold with any of them if you are good as a player.
As far as packs go, stick with core starting out. The monthly rewards for ranked are very generous, and the drop rate for cards of higher rarity are the most in your favor than any game I’ve ever played. Getting a pack that has 1 rare and 4 commons is the outlier, not the norm. Also you are rewarded more for playing more games in Duelyst, because you get 3 daily quests a day, as well as a win-of-the-day bonus. You earn at least a pack a day just from completing the daily quests. This, combined with the forgiving drop rate, makes collecting feel way better in Duelyst compared to other games like Hearthstone,
End of the day, game’s a lot of fun, I’d stick with it 