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This is the one I use.
I use it to inspect solder joints on thing like 0805 package resistors and capacitors.
I know that may not mean much but they are the tiny surface mount pieces on a PCB...

They will all serve you well, just don't get to wrapped up in it.
At higher magnification you can see things that for all shaving purposes are not there,
let the shave guide you to sharp and...

I put all but a quality 10x away,
I can see the teeth off a 5k hone if I use the light right (mine is an unlighted loupe)
I used to use a 30x but gave it up for lent :p