slow greens or fast greens?

I play several different courses and all have different types of grass and therefore different speeds.  I find that slower greens tend to not roll as true as fast greens.  I find that fast greens tend to amplify a mistake in speed and line far more than slower greens. 

So overall, slow greens are easier than faster greens, but I like the challenge that comes with fast greens.

While I also prefer a moderately fast green (10-11), part of the fun of golf for me is adjusting to the course conditions, whatever they may be.  I've played some extremely slow greens, and early in my playing life I hated going from fast to slow on consecutive rounds (slow to fast wasn't as bad).  Seemed like at first it was impossible to get the ball to the hole, and then I'd overcompensate and bang it way past.  But over time I learned to adjust both ways, from fast to slow and from slow to fast.  The one thing I try to do when I play an unfamiliar course is to hit the putting green to get a feel for what I'll see on the course.  It only takes me a dozen or so putts to get ready to play

I enjoy the fast greens more as long as they are not too fast.  But when I feel I need to hit the ball harder than normal for a given distance I don't tend to putt very well.  But I have played some greens where if you were behind the hole you either made the putt or were chipping again.  That's too fast for me.

Slow greens all day long because they dont penalize you as much for your mistakes.

Not so slow it becomes a day of short putts and not so fast that the weakest tap sends it flying. My parents club is the latter on tournament days. Anything above the hole and there's a chance it will roll off the green if it doesn't hit the hole. Though I blame the members. If the course plays too easy they complain. Usually the rough is overly long too.

Slow greens take more club head movement to move the ball the needed distance, compared to fast greens.  More club head movement also means greater error potential.   

My last round I was out before the mowers so I had some fast and some slow.  I preferred the newly mown greens (they mowed from 1-9 and 9-1 at the same time so I only had three slower greens) because the roll was true and speed was predictable.  

Fast Greens.  One of the better courses I've played with regard to greens was a small private club in San Diego which has Poa Annua grass.  The greens were immaculate and faster than anything I've ever putted on.  And I've played a lot of championship golf courses in my time... It was like you got the putt started, and it would just track to the hole with little effort.  I loved it.

Slow greens are bad greens...............there is no gray area on this subject.