A basic soaker tub simply holds water at a safe depth. Hydrotherapy models add air jets, water jets, or both — marketed for circulation and joint relief. They cost more and need a little more maintenance.
If the main goal is safe, independent bathing, a well-built soaker is often enough. Jets are a genuine comfort upgrade for sore joints, but decide whether you'll use them enough to justify the price rather than buying the longest feature list.
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