careful, some epoxy boards cave in real easy. I think southpoint are not too bad - not 100% sure - but my 7s epoxy fish was just a joke when it came to compressive strength - ie huge heel dings after one session.
Epoxy boards are way stronger against heeldents, than polyester.
You have gotten a lousy board if they "cave in"
Bad construction, bad handwork if handwork, bad materials !
Epoxy is in every way superior over polyester boards.
Stronger, lighter, less dents, no cracks and no dings, not fragile, not soft, you can repair it easily yourself and much more adhesive.
Some say that polyester has a better flex response or pattern
I dont believe that - but I believe that those who have worked with polyester most of their life - they know how to make a really good flex pattern in their boards, and if they continue to work with (sell) polyester boards they will of course defend this.
And "good flex pattern" is such a good thing to claim is "better", as it is an incredibly individual thing, as both the flex pattern and response is not a thing that can be measured and put in numbers easily - but more about how it feels
So can not be contradicted (nor the opposite) - but simply what YOU feel.
Flex pattern is basically dependant on the way your board is designed (thickness, tapering, inserts, materials etc etc).
The advantage of polyester as a resin (besides being cheaper), is that it cures extremely fast, so one can make a lot of boards in a short time - so test, change/build, test, change/build can be done really fast - which is an advantage for a few making their own boards or for a pro rider for a specific contest or situation.
But besides that (not important for most of us), epoxy is by far the better choice IMO.
Not saying polyester boards dont work - they are fine.
But I would definitely choose epoxy if I got the choice
Regarding your heeldents:
You need some reinforcement under your heels, besides the top layer glass and resin (resin = glue = epoxy or polyester) - if you want to avoid heel dents.
It could be a thicker layer of glass in this area, or carbon, or balsa or wood laminates, or similar.
So if you got heel dents in your epoxy board - it is not because of the epoxy itself (well, yes, if they got it wrong of course), but because of a bad construction or work