I don't mind .app and it has the extra guarantee that it's always https. I've used Namecheap forever and it's a good price with the least hassle. Not all TLDs

I don't mind .app and it has the extra guarantee that it's always https. I've used Namecheap forever and it's a good price with the least hassle. Not all TLDs you're interested may be there so could use a backup. The CloudFlare registrar is good too but have very few TLDs.