Headphones vs full range speakers

I only use headphones on rare occasion.   I've got a nice Quicksilver headphone amp, grado rs2e, Klipsch HP3 and while they are good for private listening , they don't come close to a quality set of speakers and amplification.  

Good headphone rigs sound great within the context of what they are I guess, but they don't have the scale and impact of speakers and when they do too much of it isn't good for your hearing .

I think the most important thing concerning headphones is comfort. No matter how great they sound if they're too heavy or don't fit well, you won't get the maximum enjoyment. My headphones fit me comfortably, I can listen to them for hours (I listen maybe 30% compared with speakers). I'd also suggest a quality headphone amp for the best performance.

@ghdprentice pretty much nailed it. With headphones you lose some soundstaging  and the visceral feel of the sound on your skin but you'll likely hear more low level detail, channel gimmickry (good or bad) and they take out the room affect factor.

What is with the either/or premise?

It is true generally that we can hear more details with headphones...

The problem with this "truth" is that this truth is an "half-truth"...

And half-truth are more deceiving than lies...

If the speakers are not well chosen and if they are not imnplemented correctly in the room acoustically electrically and mechanically, yes they will give way less details...

But it is not true for my speakers now in my actual controlled room...I have the same level of details in my listening position than with my headphones...And probably an improved way to present these details than with an headphone...

then.....

Headphones with their vastly superior transient response are more lifelike, but I prefer speakers.

At least until I can find a pair of headphones that will let me forget I'm wearing them.