Are you really serious about this question? While both Juno and Atom are fine, or more than fine, at the moment, you have to be able to extrapolate into the future. Atom is clearly being abandoned in favour of VS Code. Continuing to focus efforts into Atom would be the very definition of a dead end.
Put another way: if Atom is fine, and Juno is fine, neither one needs further development. You could just keep using both in their current state, in perpetuity, right?