Porkbun. Their prices are very reasonable and their support team is consistently responsive and helpful. Honestly, even if their pricing was higher I would still choose to use them because it's clear their goal is to maintain a useful product, not infinite growth andendshittification
Interestingly, Cloudflare (don't shoot me for mentioning the name, HN!) identify Porkbun as "GoDaddy-Porkbun" but I don't know the relationship.
Edit: "Top Level Design [Porkbun owners] was the domain name registry for several top-level domains including .wiki, .ink and .design, until the company sold these domains to GoDaddy Registry in April 2023" --Wikipedia
Top tier is still MarkMonitor. Last I spoke with them, they had a five-figure minimum spend, but the per-domain costs are competitive. That cost buys you proper named support contacts, etc.
If you look up the whois for microsoft.com or yahoo.com, that's who you'll find.
Five-figure minimum spend sounds pretty expensive for the vast majority of businesses out there. Of course, just a drop in the bucket for major brands.