Peepso looks decent. Played around with the demo. But I still like Ultimate Member more. It looks better and more modern right out of the box. I am currently building a new site, not launched yet. We are going to be launching next week and we have built around Ultimate Member. I was really hoping I didn't have to switch over to Peepso, that happens to me so often. Right before launch someone releases something better and I have to switch my code over.

Peeps doesn't look bad, but after comparing them I am just a bigger fan of UM.