In my humble opinion, if wounds are ALL you do, I believe there only two credentialing bodies that offer certifications that confer expertise in wound care and demonstrate your dedication to the specialty.
wound specialist or CWCA-certified wound care associate
(wound ostomy care nursing, or any combination of the three scopes of wounds, ostomy, continence) or WTA-wound treatment associate
Sure, there are other "certifications" but it all depends on your goals/scope. If you are a home health nurse, maybe the one week $3,000 course that gets you "wound care certified" (WCC) is fine. I have heard it is extremely informative and on point, but, it has very minimal pre-requisites. As a non-specializing nurse, I think it's great to get "a little of everything", but if you're specializing in wound care you need more than an expensive one week class with an exam at the end.
FWIW I have no cert but have applied for the CWS exam.