Hi @ChristianRRL,

Both modes incur cost from DBU/h usage based on your compute configuration. Keeping all other variables same, only way I can think of having a cost comparison is to set up two streams that point to the same dataset with different modes and measuring durations of both streams. 

When calculating total cost of your setup remember to include:

• Cost of the I/O operations from your storage provider, especially on directory listing mode.
• Cost of the notification and queueing service required for file notification mode.