Which course is best if I want to become a CSM?

Hello all!

My company has suggested I might be interested in a career change into the Customer Success role. I am currently a Sales Development Rep so there is a lot of learning to do to get up to speed if I want to excel in my new, potential role!

I am thinking of this level 1 CSM course: 

SuccessCOACHING Customer Success Manager Training | SuccessCOACHING

Or 

This one: 

CSM Certification Program - 15 Classes - The Success League

Which one would you recommend for someone brand new to the CSM role?