The question has been asked before, but only about other peoples’ situations, not about yours.

The trick is to think about what you need and want, not about what other people chose. So…

What kind of music are you planning to make?
What musical experience do you have?
What other gear do you have?
Why do you need to spend more money on gear?
Do you have musical collaborators? If so, what gear are they using?
Will you be playing live, or composing in a studio, or other scenario?
Do you have the time to learn two new instruments at the same time?

Why are you not considering gear from other manufacturers?
Why are you set on the Analog Four?
Between the MD and the AR, which one sounds better to you?

If you ask people to recommend gear without answering these questions, you are asking them “what gear should I buy to impress you?” not “what gear should I buy to make music?”. Which is OK, if you understand that that is what you’re doing.