Sorry for the delay - I was taken in for repair.
Everything looks good - thanks for posting the screens. Since they report A-O-K I don't need to wade through the log.
The /Online option:
Specifies that the action is to be taken on the operating system that is currently running.
When /Online is used the Windows directory for the online image is automatically detected.
I was hoping that it said: this is the default
Since I can only assume that the currently running OS was detected, please run the command again ... with the /Online option.
Defender is fine for most users. It's really a personal choice or a comfort level.
I've used almost every AV product out there - I change when they bloat and try to do more than AV/malware
Avast and AVG are merging so the underlying engine should be the same at some point.
Most, if not all, 3rd party AV products turn Defender off - check your machine after installing one.
There's also a nifty Defender setting - periodic scans. I haven't used it (new in 1607) ... I think it wakes up every once in a while and sneaks in a scan.
You can use many on-demand scanners ... You only want ONE real-time AV product running
The choice is yours