I like sorcerers. They seem complicated, but are actually really simple. Spellcasters are, in fact, simple, compared to others who get abilities at every level.

Artificer super op when you reach good levels (~lvl.10)

so what it can survive in the wild? A druid can do that, and circle of the moon gets like 100 free hit points per short rest

I like warlocks because they have so many options that grant access to a slew of optimization possibilities.  They are also amazing for multiclassing, thanks to their short-rest recharging spell slots and eldritch invocations.  They aren't nearly as complicated as artificers, and your options with Pact Boon, Eldritch Invocations, and Otherworldly Patrons give you a clear playstyle.  Some people feel hampered by the small quantity of spell slots, but if you think about it, warlocks don't need much spell slots.  They can rely on concentration spells, while otherwise relying on eldritch blast as their main source of damage.  Many warlock subclasses give you a concentration-spell-like ability that doesn't require concentration or a spell slot.  The ability to regain spell slots on a short rest is actually pretty powerful, because you don't have to worry too much about resource management if you know you will have time to catch your breath in between fights.  Most adventures allow for two or three short rests per day, likely occuring in between combat encounters.  This can allow you to cast spells all day, but you won't even need to use very much of your precious spell slots, as you'll be best off concentrating on hex or a concentration control spell like hypnotic pattern, banishment, or hunger of hadar, while you continously spam eldritch blast.  Multiple EB bolts can stack up very quickly in damage output if you have Agonizing Blast.  Warlocks might be the best blaster mage.  They surely out-perform wizards, because wizards aren't meant to be dedicated blasters anyway, they are meant to be versatile utility spellcasters.