Is X-Plane 11 payware autogen scenery better than what is in program? Example:A-Plane's payware for GA/FL autogen scenery is $16.99. Is it noticeably better?

Stear away from Taburet, it is sur par for what is already available in sim, or what you can create for free with w2xp. I bought from them in my FSX days and it looks they didn't improve since.
The default is vastly superior.

What I think you want is HD mesh v4 by AI pilot, or UHD mesh v4 . It will provide a much better coverage, using the default autogen.
You can find links to the downloads on his page: http://www.alpilotx.net/downloads/x-plane-11-hd-mesh-scenery-v4/ .

Keep also an eye on MisterX (https://www.thresholdx.net/news/sfdgbl) , you can try his Japanese freeware scenery to see what he is capable of (available on the .org).

 

I bought their Night XP CA, it was garbage. This dev seems like they just want to make a quick buck....

Currently, the only good Autogen upgrades are Japan Pro (free) by Mister X and his upcoming sceneries.

Thanks much. As you can tell, I'm an X-Plane noobi looking to learn.