I used to be a Namecheap customer, I have been using Google Domains for a few years now. Namecheap isn't that much cheaper, maybe a dollar or two per year in my quick look just now. I've found Google Domains really easy to use for my personal domains, including for dynamic DNS. So far it's just worked and I've been happy with it.

Not to say that Namecheap was hard to use, just that Google is pretty easy and the cost difference isn't enough to make me want to consider switching back to Namecheap.

I do not recall why I stopped using Namecheap, it was a while ago.