Doorway vs. wall-mounted vs. ceiling-mounted: which should I buy?

Doorway bars win on price and renter-friendliness but limit grip width and exercise variety. Wall-mounted bars are the most popular all-rounder in r/bodyweightfitness and r/GarageGym discussions because they're rock-solid once lagged into studs and free up your doorway. Ceiling/joist-mounted bars are favored by users with low ceilings or open garage rafters, though high-trust carpentry discussions we read flag that screws loaded in tension (pulling straight down on the joist) are weaker than screws loaded in shear (a wall mount), and recommend lag bolts rather than wood screws.