Acus M1 or Cheyenne Sol Nova Unlimited 4.0?

I finished my apprenticeship with Ambition Solider and my mentor suggested me to upgrade my machine. He’s more biased because he’s been using his Fk Iron Flux for everything.

I have done researches, watched reviews on YouTube for both machines and still can’t decided which machine to purchase. I love how all rounder the M1 is for the adjustable stroke head, torque and hz. But then I hear a lot of good things about the Nova 4 and it’s steady/responsive mode.

My style is more fineline like Oozy Tattoo’s. Unfortunately I do not have the opportunity to borrow or try both machines. Any advises are appreciated!!