This is a hard one. One thing that helped me is to realize that Csus2(C-D-G) has the same notes as Gsus4(G-C-D). Csus2 is really the first inversion of Gsus4. This means that we have to pay attention to the relative octaves as well, when we take apart the notes. Hope this helps.

I'm still confused with those Sus chords. It is so hard! @@

the problem might be that you are flipping the notes. c-f-g- is sus 4, but f-g-c is sus 2. Hearing where the M2 is ( f-g in this case) and listening if there is a note beneath that helps me, maybe it will help you.

I use The Force and still only get it right half the time

Wasup Ray Z,

My personal suggestion would be to understand how they relate to the major chord. Although they have similar chord qualities, and are interchangeable with their closest circle of fifths neighbor, they suspend two different resolution notes (the 3rd in sus4; the root in sus2).

Once you get a grasp of where the suspended note wants to resolve to, you'll better understand how different they sound.

To my ears, the sus4 is much more subtle and embelished, way more pulling to resolution, very often used in music to add a little tension to a section's final chord. Whereas the sus2 is just interesting, very stable by itself but also a little mysterious and sparking curiosity, giving you a sense of indetermination, it doesn't really pull to resolution as the sus4 does.