The short version
This is not a close call. Healthy Wave Multi-Wave is a conventional PEMF mat with disclosed parameters and stacked infrared and red light. Qi Coil is a portable coil built on Rife-frequency and “scalar energy” theory, with no credible evidence and no published PEMF specs.
Why Healthy Wave wins
It behaves like an actual PEMF device: you can read its waveform, frequency and intensity and match them to the research. It stacks three recovery modalities in one mat, and it costs less than the mid Qi Coil tiers. For a deeper field of options, see the best PEMF devices.
The one thing Qi Coil wins
Portability. A coil-plus-app you can carry beats a full-body mat if that is the single thing you care about — but it does not close the evidence gap.
Bottom line
If you want PEMF, buy PEMF you can inspect and that is grounded in research. Qi Coil is a frequency-wellness gadget wearing a PEMF label; Healthy Wave is the real thing at a saner price.