[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.]