Four bolts v spring compressors ... 
Its a bit more than that realy though.
First off you need spring compressors (not everybody has them).
For both methods you have to jack the car up.
One requires a few more bolts removing, they other is a bit fiddly with spring compressors.
The guide covers a job by taking an approach which requires minimal specialist tools and is simple so means more members can do it. 
by that I mean....
Once wheels are off, shocks are undone, drop links undone, your ready for spring compressors ?
At that point what else is there to do if dropping subframe? Un hook brake lines, and make sure abs sensor plugs are out the way. Then it's 4 bolts to undo although depending on spring length they may need levering out, versus winding spring compressors in with possibly limited access depending on which design sc's used... As you say.
Given the choice I'll take the four bolts etc, as your guide. I have sc's in the tool box and their a pita IMO.
But what ever works for the individual obviously. Your guide seems so simple and less fiddely IMO...

Anyway, interesting discussion none the less.
