When comparing two GDrive remotes, output does not specify which is the one that has missing files.
pi@raspi:~ $ rclone check gd1:Test gd2:Test
2018/04/18 21:23:31 ERROR : latency.exe: File not in Google drive root 'Test'
2018/04/18 21:23:31 NOTICE: Google drive root 'Test': 1 files missing
2018/04/18 21:23:31 NOTICE: Google drive root 'Test': 1 differences found
2018/04/18 21:23:31 Failed to check: 1 differences found
pi@raspi:~ $ rclone check gd1:Test gd2:Test -vv
2018/04/18 21:23:39 DEBUG : Using config file from "/home/pi/.config/rclone/rclone.conf"
2018/04/18 21:23:39 DEBUG : rclone: Version "v1.39" starting with parameters ["rclone" "check" "gd1:Test" "gd2:Test" "-vv"]
2018/04/18 21:23:42 INFO : Google drive root 'Test': Modify window is 1ms
2018/04/18 21:23:42 INFO : Google drive root 'Test': Waiting for checks to finish
2018/04/18 21:23:43 ERROR : latency.exe: File not in Google drive root 'Test'
2018/04/18 21:23:43 DEBUG : GPU-Z.0.6.6.exe: OK
2018/04/18 21:23:43 DEBUG : cpuz-readme.txt: OK
2018/04/18 21:23:43 DEBUG : cpuz.exe: OK
2018/04/18 21:23:43 DEBUG : cpuz.ini: OK
2018/04/18 21:23:43 NOTICE: Google drive root 'Test': 1 files missing
2018/04/18 21:23:43 NOTICE: Google drive root 'Test': 1 differences found
2018/04/18 21:23:43 Failed to check: 1 differences found