Based on our record, Duck DNS seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If a changing public IP is the problem, take a look at duckdns. Source: over 1 year ago
Why don't you use Dynamic-DNS like https://duckdns.org and have the pi send your IP to the DDNS with script automated to run every 30 mins in crontab. That way you don't need anything like what you talked about and your DDNS would update from the very same pi that you are running the pi on! Source: almost 3 years ago
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No-IP - Dynamic DNS and Managed DNS Provider
dofo.com - Domain search platform Dofo.com gathers all registered (350 million) domains of the world in a single place. Dofo also brings together all the domain names that are on sale, provides useful features, all completely free.
FreeDNS by Afraid.org - Free DNS hosting, lets you fully manage your own domain. Dynamic DNS and Static DNS services available. You may also create hosts off other domains that we host upon the domain owners consent, we have several domains to choose from!
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Dyn - Managed DNS, Outsourced DNS & Anycast DNS