Pushing battles in joseki 1

Joseki choice  

In this position (Kajiwara-Sakata from the 1983 Tengen) White has the joseki choice problem: is it a next, which is more normal, or b? To play at b allows Black a in sente.

Foreseeing the pushing battle  

White chose b in tune with the importance of Black's push at 4, which starts a pushing battle. White 1 becomes a well-placed stone. White's shape is strong enough for White to invade at e after the exchange White c, Black d.