I have both. The DEHP's have different electronics and a coating over the boards. They also do not have the audio input jack. To me they are more moisture resistant than the Sordins.
That said my Sordins went strong for over 10 years. They have some corrosion internally, and shut off by themselves ever now and then, but they still work fine.
The price difference is a bit steep, but for my use the DEHP is worth the upgade. If it's for more occasional use, either will be great and the cash may be better spent elsewhere.