Importing Evernote .enex file with 46 thousand notes

It really depends on your notes. If they are relatively simple notes without too complex formatting, Markdown is better. Otherwise HTML would help keeping the notes very similar to the way they were in Evernote. I'd recommend trying with HTML first and see if that works for you.

The only way to know is to try!

I've been using the Fujitsu ScanSnap 1500s scanner since I began using Evernote. Can I integrate a similar scanning workflow into Joplin?

Have a look at this post: