How to choose a transit provider?

Hello there, I have started writing a blog which I hope it would help buy transit services from providers by doing various due diligences(technical) i wanted to reach out and ask nanog community’s thoughts on this. What are some of your checklist items ? Price? Their directly peered networks? If they are tier 2,3 who they use as tier 1-2? Are the onnet? I am sure list goes on and on on... Thanks a lot for your help. I plan to write the blog this month and publish. Mehmet -- Mehmet +1-424-298-1903