Tokamak vs stellarator — quick take:
Tokamak: axisymmetric device that drives a strong plasma current. Simpler coil geometry, historically better confinement and higher performance (e.g., ITER), but needs current drive, can be pulsed and risks disruptions.
Stellarator: twisted external coils produce confinement without big plasma current. More complex coils and engineering, but steady‑state operation and far fewer disruptions (e.g., Wendelstein 7‑X).
Pick tokamak for peak performance, stellarator for continuous, stable runs. 