Session management when using @InboundChannelAdapter vs multiple SftpOutboundGateway to achieve same behaviour

Question

I have two services doing similar operations as listed below

Service A

Service A uses @InboundChannelAdapter and does following task

1. polls files every 1 minute from remote directory into local directory
2. deletes files from remote directory
3. process files from local directory
4. delete file from local directory

Service B

In Service B we are achieving similar but by using OutBoundGateway.

1. Using a external http call to invoke file downloading and processing process every 1 minute
2. downloading the files from remote directory using OutBoundGateway sftpchannel1
3. process the files from local download directory
4. delete files from remote directory using OutBoundGateway sftpchannel2
5. delete files from local directory

My current concern is if we keep number of polls and file load same for both service A and B, then which service manages the ftpSession better.