It looks like you’ve got a Digitakt and a Digitone already. I haven’t used those, but everything I’ve read suggests they are like the big Elektrons in that it is fun and easy to start with a blank pattern and init patches and build everything up from scratch. Put headphones on and turn on the A4 and the hours will melt away.
The A4 should also compliment your Prophet and Moogs. Your studio suggests that you have a deep affection for analog synths. Even if you don’t end up clicking with the A4, you seem like the sort of person who would enjoy the process of discovery nonetheless.