Tokamaks are different beasts than stellarators. They have a toroidal current induced by a central solenoid (literally a transformer). There are pros and cons to this. For one, you get a lot of ohmic heating and some focusing benefits from the current. However, there are plasma instabilities and there needs to be electrical feedback systems operating with microseconds of latency. This isn't trivial when dealing with huge currents and voltages at high inductance. Additionally the transformer can only induce current in one direction for a finite time (you cannot ramp current to infinity). No one has figured out how to make tokamaks steady state. The best hope is for runs of a few days and 80% uptime. It's undetermined if this is "good enough".

Stellarators have traditionally lagged tokamaks in terms of Lawson criterion performance, but they've also been less funded because tokamaks have performance advantages. Stellarators are steady state and don't risk the same number of plasma instabilities. Germany is so confident that it's the right approach that they built the largest magnetic confinement device ever to test optimizing for quasi-omnigineity. Stellarators in general are becoming closer to the mainstream approach and given another 5 or 10 years you'll likely hear about them as much as tokamaks (at least in terms of non ITER research).