GetSQS vs List/FetchS3 polling costs

[#1]

Hi there, 

Maybe someone can shed a light on a question I have regarding the costs difference between GetSQS and ListS3. Both polls a certain target and from this action costs are made. At least this is the idea i get when looking at the properties (run schedule setting under scheduling tab). 

Or does the GetSQS works differently?

Setup i'm thinking about is:

AWS(S3 --> SNS --> SQS) --> Nifi (GetSQS --> FetchS3)

insead of

AWS (S3) --> Nifi (ListS3 --> FetchS3)

I'm leaning towards the eventdriven solution, but think that polling costs would be the same for both.

Hope you can share some info on this and clear things up.

Thank you in advanced.

Greets,

Dave