What has the DM41 extra over the HP42s?

[Logan]

I agree with Thomas as well.

Personally, as someone who never had an RPN calculator until 2015 or so, I have no nostalgia for the HP41. I have had the DM41x (beta) since January and while I've run it a few times and made a video on it, I actually use the DM42 every day. I find in practice that I don't need 500 ROMs and built in programs. I just use a few I programmed myself and the interface and capabilities of the 42 are quite a bit more polished and useable in my opinion.