Extract issue..

[micheus]

Guess both ways work. I must not have quite got what you meant.

Don't guess! You need to try them. That is the best way to learn about the commands and discover which combination is better and/or faster.
I alway try to use the selection groups as many as possible, since it's something that uses to speed up some processes.

Its not always clear what exactly the options do differently. :p

That is true, but is hard to explain some of them in a few words.

Circularise is one interest command. Google for Wings3d circularise. You will find at least four videos about it.