One reason is that I can use iPython with a decent text editor like emacs. I've tried to make Jupyter work, but it seems like you're supposed to use the web based editor, which is horrible.
But it's also just not a nice workflow. Projects are not linear. I tend to work on a function and get it working in the REPL. Then build up the program by combining together higher level functions. How am I suppose to test functions in Jupyter? Write the test then keep evaluating it and then delete it later?
Jupyter is not linear. You can edit and evaluate any cell at any time. If you don't want test interspersed with the code, you can keep tests at the bottom by adding cells in the middle.
But it's also just not a nice workflow. Projects are not linear. I tend to work on a function and get it working in the REPL. Then build up the program by combining together higher level functions. How am I suppose to test functions in Jupyter? Write the test then keep evaluating it and then delete it later?