I would go with the 6HC assuming it's drive capabilities can handle your steppers. I have two of them in use and are quite happy with them.
Have you considered the E3D Revo line of products? I have used the Revo Hemera XS, the Revo Roto and the Revo Micro which needs an external extruder device. I used the LDO Orbiter.
They are not the cheapest but being able to swap nozzles with no tools is a good feature. And they have a good selection of nozzles.
I've got a box full of the older style, the type using a cartridge heater and temp sensor in a chunk of metal that are bound for the dumpster.
Does the Eddy device work with the Duet 3 firmware? I had not heard of that device. I went with the Duet 3 Scanning Z Probe (SZP) which works just fine AND includes an accelerometer on the little PC board.
Currently the SZP doesn't work as a typical Z probe but they are working on it. I went with the old but reliable BLTouch.
Frederick