I have had them both. My PVC one tipped over and cracked and at that time they only made stainless so that is what I got. I was a little concerned about bending the inlets or outlets because the Steel seemed thin but I never had a problem. I would never go back to PVC
Stainless is easier to rinse out IMHO but the biggest difference is how the cover attaches. Its a better seal on the stainless unless he changed the design on the PVC cover. On a couple of occasions, I have had the Devastator inside the home and you can not hear ANY leakage.
Great work, Tom!