Feels like a false dichotomy to me.
Personally, I think high walk rate, low k rate, and high LD rates (which have the greatest chance of turning into hits, including X-base hits, even if not dingers) are the joint by product of the same thing -- a good approach at the plate and a good swing.
For guys, who haven't yet reached their full man strength, they should focus on putting good swings on good pitches to hit. Power will come.
If you focus on putting a good swing on a good pitch to hit, you will be hunting pitches to drive early in the count and also when your are ahead in the count. If you get a pitch to drive, you should go at it with an aggressive swing. You should want to punish the ball. Often enough, good things will follow. Not always, of course, since on the offensive side baseball is a game of a massive number of failures.
But don't go chasing pitches that you cannot drive, especially when you are ahead in the count -- unless you are the second coming of Vlad the Impaler -- who could drive any pitch he could possibly reach.
Sure, when the count turns against you, you gotta expand the zone. You gotta be able to fight off tough pitches or you are toast. If you are the kind of hitter who can fight off tough pitches with a degree of regularity, you will get both your fair share of walks and your fair share of hits, even when the pitcher has an intrinsic advantage.
Sure the pitcher will get you out at times. If he can spot that nasty breaking ball either when he's got the count in his favor or when you're sitting dead red for one reason or another, he will get lots of hitters out. Personally, I love pitchers with enough control over their breaking ball that they can throw it in like 3-2 counts and make the hitter look helpless. Also love pitchers with great deception that makes the spin of the ball really hard to pick up.
But the thing is, don't get yourself out. Don't go hoping for a walk either. Seize your opportunities to hammer a pitch, when a pitch is there to be hammered. But let pitches that you cannot drive go, especially when you are ahead in the count. Fight like hell to extend at bats when you are down in the count.
Walks, a dearth of K's, and plethora of hits will follow. No need to choose.