Power rack, half rack, or squat stand — which do I actually need?

A full four-post power cage is the safest and most versatile choice if you have the ceiling height and floor space, because the safety bars catch a failed rep without a spotter. Half racks save floor space but require spotter arms you trust. Squat stands (two uprights) are cheapest and most portable but reviewers across r/homegym consistently flag wobble and limited safety, fine for light- to mid-weight lifters but not ideal once you're pushing past bodyweight squats and benches.