Which GoDaddy/Afternic "Fast-Transfer partner registrar" has the best "Bulk Domain Management Tools"?

Hi,

I am wondering (before transferring/renewing our 4000 dot-com domains before Aug 31) about the following:

Q1: Which GoDaddy/Afternic "Fast-Transfer partner registrar" has the best "Bulk Domain Management Tools"?

Q2: Can you select at-once 5000 domains (or at least 1000) for updating name-servers, registrations, renewals, transfers, and bulk domain searches?

I was going to transfer to Porkbun but you can only manage 100 max domains at a time.
I am currently inclined towards moving to Sav.com but don't know about their bulk domain tools.
I also looked at Cloudflare.com which has at-cost pricing but don't know about their bulk tools, plus it appears Cloudflare is not GoDaddy/Afternic partner.

Basically looking for good pricing and great bulk domain tools.

Please share your experience about GD/Afternic partner registrars that has good pricing all the time and great bulk domain management tools.

Thank you.