Usually this comes down to the way you have been taught...and what type and strength peel you are doing, usually the first time that you are shown is the way you will most likely do

but common sense tells me (been doing this for 20yrs)... clean canvas first (light microderm) nothing too strong... then the peel... you won't have any dead skin cells blocking peels performance .... and you get better result... some peels now have numbing effect so it is more comfortable for the client...

To me it seems like if you do the peel first ... which some you leave on for a min 4hours and don't wash off while client is on your table anyway... you would just be manipulating the layers and getting uneven result.

I have had great results doing it this way and the clients come and do several more because they see a difference in there skin.

I do the peel first if I'm addressing acne scarring, the microdermabrasion first if addressing deep hyperpigmentation, melasma and get great results.  I do use a 10%-20% strength acids in most cases. Results are great with fruit enzyme peels too.

Great question! I personally do the microderm first...my thought is that you want to remove as much of the dead skin cells as possible so that the peel can be most affective on the deeper layers that the microderm doesn't reach. I do however only do light peels, lactic 15% glycolic 30 or 60%. I use Glo Therapeutic products and this is also their protocol. Good luck!