I do a fair bit of macro photography, indoors with good lighting, using either a focus rail or manual focus pull to image-stack.
I've always considered that using extension tubes for this gives me the most flexibility. With one set of tubes I can vary the tube length in seconds; I can swap lenses at will; the electronics line up to the lenses so I can still vary the aperture. I can't use auto-focus, but at these magnifications I don't think that would be any benefit.
So, having read a few posts on here about reversal & that it might give me a sharper image, among them Why does a reverse lens act like a macro lens? as an overview & What do I need for reversed-lens macro photography with an entry-level Nikon DSLR? for a comprehensive setup & equipment guide, & even What are the biggest differences between Reversal Rings, Extension Tubes and Macro Lenses? which really seems more concerned with why I should give up on both & get a dedicated macro lens.
I'm left wondering why I would go to all that effort to flip the lens round, investing in different mount adaptors for each lens I want to use, against simply continuing to do it the way I do, which I've become reasonably adept at.
Is the quality gain all that noticeable, even after stacking?
This is an example of about as small as I'm going, 2mm bud from an allium flower head, done with a nifty fifty f/1.4 at f/16 on 68mm extension, D5500, 4-layer stack [I've gone over 20 for larger objects]
I'm pretty happy with it.
This will click through to a ⅓ size image