Just as an FYI, you can switch registrars down the line if you don't like one, after a 60-day delay, so you aren't committed for all time. Probably some minor fee associated with that at the destination registrar, like might require a renewal or something, dunno.

Some registrars historically provided more or less information about you to whois; used to be that they required real names to be visibly-attached to domains to have a contact for abuse. I think that current registrars may not do that any more, but might be worth checking up on that if it matters to you.

Price may differ.

Some registrars may provide bundled services. Webhosting is common. I get mail service for a domain I have from my registrar, since I expect the registrar to be around for quite some time and there's a remarkable paucity of mail service providers out there today. I also get (no-additional-cost) DNS service; I'd guess that most-if-not-all registrars provide an option for that, just to simplify setup of the domain; not sure if that is of interest to you. You may or may not (this is the selfhosted community) want any services.