rclone sync is the equivalent of rsync--delete.
Rclone is recursive by default so no need for -R.
Rclone doesn't use the -a flag. You might consider the -M flag to preserve more metadata but whether this is useful depends on which cloud storage system you are using and what you want to acheive.
-v is the same!
Rclone doesn't support compression (the cloud storage providers don't).
So the rough equivalent would be
rclone sync -v source remote:destination