The original crown does come with a lot of coil head options and adjustable airflow. You may also be able to use a different driptip if looking for that more "MTL" experience for some of your friends to taste your juices, as well as more airy and sub0hm vape for other pals who might vape that way. It's a versatile tank and a known "flavor" tank. Your only issue could/may be with flavor changes.... You may need to run some unflavored eliquid through them between tests as otherwise you may get flavor bleed, etc. Some folks do use RDAs (drippers) for this reason as cotton can easily and cheaply be changed quite rapidly. But, if your friends are used to vaping tanks, then that may be your best option.
If you want a more MTL option, you might want to consider a 2ml TPD version of the Ego One Mega V2. It's a smaller tank, and offers great flavor with the right coil which would be a Joytech CLR coil (they come in 1.0 and 0.5 resistances.) I mention them because they are also a great flavor combo, tend a bit more toward MTL but they can easily be rewicked (or even recoiled) but rewicking is pretty easy indeed, so that might be an option for flavor changes. The smaller tank would mean it might be easier to run unflavored through the coils, too. It's just a thought, although I think the Crown Uwell could be a great choice as well. It's a much larger tank, so you may have to clean your coils or run more unflavored through them, would be my only concern (which may or may not be valid).
Anna