I suspect there is no "right" answer here but let me give you some advice.
It sounds like you are UK based? Right now in the UK I'd say PMP/Prince is more popular, but that means more people are pursuing the jobs. ACP-PMI and SAFe are new-er, both aimed at large organizations.
Personally, I'm interested in smaller organizations, so I find Scrum.org and the Scrum Alliance's Certified Scrum Master as more interesting. Those are all little 2-day classes, so I'd go beyond that and recommend Certified Scrum Professional.
That will help you get into small to mid-sized companies as an Agile Coach. To really get in, I'd suggest masterying the subjects. Don't just take courses - read books. Get on mailing lists. Meet the people who wrote the stuff - at least virtually - and ask them clarifying questions. Eventually, present your ideas at conferences.
Certifications demonstrate that you've memorized the material. Demonstrate that you've mastered it by adding to it and teaching it!