I am no expert...it's only been three weeks, but that's what I use. I tried hollister and coloplast. My stoma is retracted so I needed something with a deep convex. So I use their one piece system. I would prefer a two piece so it would be easier to clean the bag, but oh well. I don't like the closing system (a clip). I use a cup to clean out the end area and that works pretty well.
This was the second time I have put on the marlan. The first time I replaced after 4 days...no leaks. This one it is day 2 and feels even better than last time.
Oh, and I use the 4 inch ring. I put it directly around my stoma after I blow it with my hair dryer for a few seconds. Then I put on the marlan and press hard all over it. Then I use the hair dryer again. Then I lie down with a heating pad over me. I know, overkill, but I had so many problems I don't want to take any chances.
I just ordered samples so I could have extra. You can request from their website.