Hi
The professional ones are really harder than the associates ones. So if you are not sure yet, you can already removed them from the list. Furthermore, you are required to already have an associate certification to be able to pass the professional exam.
Then, from a developer perspective, the sysops is out of scope (interesting though), but the real choice is between the Solution Architect Associate (SAA) and Developer Associate. Both share 90% of the same content. Really. So it's highly recommended to pass the second one if you get the first one. If you want to pass only one, then the developer associate is probably the best fit, since it has a little bit more DynamoDB content than the Solution architect (that's really the only difference)
It's also worth mentioning than the certifications are quite out of date (they are updated, but always lag behind the current state). As of last year (I passed both SA and Dev Associate in march 2017), many critical services were just not covered at all by those exams: ECS, Lambdas, API Gateway, ALB, ...
Finally, I believe certification are useful when you already have experience with AWS: it's a kind of validation, and it also forces you to learn more about services you don't need or use (like SWF). If your goal is not the certification itself, but gaining experience and knowledge about AWS, then the few hours to pass the online "Well Architected" test, and the hours and hours of re:Invent sessions are probably much better invested time (re:Invent sessions on Youtube are really the best way to learn a ton of stuff about pretty much anything AWS, from the getting started stuff (1xx sessions) to advanced inner working (3xx sessions)