[Question] What are the merits of signing up for cryonics with Alcor vs. with the Cryonics Institute?

I am signing up for cryonics this year, and I need to figure out if I should pay extra to do it with Alcor instead of CI.

What’s the balance of evidence on this question?

With which organization have most cryonicist LessWrongers gone? [edit: I made a google form for this more specific question here.]