| Brand positioning | Broad, feature-rich, technology-forward | Focused, therapeutic, value-aware | Choose by shopping style — wide field vs cleaner ladder. |
| Best for | Tech & feature shoppers | Comfort & clarity shoppers | Match the chair to how you actually compare. |
| Massage technology | 3D, 4D, 4D+, AI, Duo | Standard, 4D, 4D AI, Syner-D | Both modern; Osaki has more variations to test. |
| 3D / 4D options | Wide range across price tiers | Premium 4D path: Yugana, Joubu, Hatsumei, Nokori | Both cover 4D; Osaki goes wider, Kyota goes deeper-per-tier. |
| Body scanning | Available across multiple tiers | Across upper tiers; AI on Hatsumei M900 | Test scan accuracy on your shoulders before deciding. |
| Zero gravity | Across mid-to-upper tiers | Across most tiers including Joubu M880 | Both offer it; recline angle differs — test in person. |
| Heat | Lumbar / back heat on most premium models | Heat comfort on mid-to-upper tiers | Confirm heat zones (back vs calves) on your shortlist. |
| Foot / calf massage | Varies by model — strong on Duo / Atlas XL | Therapeutic calf comfort across the lineup | The most underrated zone — test it last but most. |
| Smart controls | Touchscreen, remote, app on premium | Streamlined remote; AI on Hatsumei M900 | Whoever uses it most needs to enjoy the controls. |
| Model variety | Wide | Focused (5 models) | Choice is great if you want to compare. It can also overwhelm. |
| Price range | Broad coverage from value to flagship | Clear ladder from Genki M380 to Nokori M980 | Set your budget first; then narrow within it. |
| Best buyer type | Feature-driven, family of mixed users | Comfort-driven, clarity-led shopper | Pick the brand that matches your decision style. |