Which gacha is the right choice?

Are you referring to the Path of Training when you say free breakthrough? It takes quite a while, but you accumulate them little by little by clearing dailies (probably 5 days within a week is OK). You can also get important items! As for the gacha... let me get straight to the point: pull for the characters you like!! Other than that, Snezhnaya is coming up, so you might want to wait for that too 👍

For beginners, I recommend newer attackers or characters who are like gods 🧐 In Genshin Impact, the first hurdle is usually combat during exploration, so having an attacker who can wipe out most enemies even without much investment is reassuring ( ´∀｀)b Newer characters generally have higher character power, so it's less likely to go wrong if you choose the latest attackers 👍 The reason I recommend god-like characters is that they often have excellent supporters and are frequently rerun ⸜(*ˊᗜˋ*)⸝ Especially for beginners, having a character named 'Zhongli' will make things considerably easier 🤔 Zhongli can deploy a very sturdy, long-lasting, and cyclical shield, which, if properly invested in, can block almost all stuns and damage (ㅅ´∀`*) You won't have to worry about character HP or dodging, and even attackers with low durability can be used easily, so you don't need to consider durability when choosing an attacker 👏😭