I personally have never had a PM3 easy but the key differences other than the price are:
- Firmware, it’s identical source but, when building the firmware you may need to set the build target to pm3 generic when building new versions of firmware.
- antenna options, DT sells a LF antenna specifically tuned for the X series chips. Unfortunately no HF antenna yet
. But these antennas are only compatible with the RDV4 because it’s designed for swappable antennas. - build quality, the easy is a generic version that is manufactured by various companies with varying degrees of build quality and quality control. Essentially your milage may vary.
If you already have a easy on order may aswell give it a go, it’s got all the same capabilities afaik. I would argue if you are investing in implants, if you can afford the RDV4 you may aswell because it’s the best tool available and at least in my case I’d rather not risk bricking something because of communication issues or just dealing with any hassle. But plenty of people have an easy so it obviously works for them.
Edit:
Also obviously it’s a different form factor as you pointed out. The RDV4 package is quite compact (depending on antenna module, you can get some rather large ones) and looks much more sleek.