GoDaddy By far the most the most popular registrar. More expensive than other registrars and a little sleazy with the upsells. Some will appreciate the phone support and localisation.
Epik They have some cool features and good prices. I have one name there and may transfer more there in the future.
Google I haven’t tried them but the interface is nice. Prices are a little higher.
PorkBun An oddly satisfying experience.