When in doubt from which side to approach a corner, it is usually better to take the wider side i.e. the side where there is more space to make a base and/or more potential territory to be destroyed. This is conventional wisdom and hence often defied these days.
Here, the upper side is wider than the left. Although White's position is said to be slightly overconcentrated, still she can extend to with satisfaction.
If she enters on this side however, her position gets really cramped.
Dieter: Yes, Bill, that's where I put it first. The I noticed that the comparison to the other diagram could be improved. Even so, you think this makes more sense ?
Bill: Well, both positions are cramped, but this one less so. :-)
Charles See also approach on the open side.
bud1027 : this is another possible picture(or result) that black can consider...