We can really do crazy effect with GLSL, easily and efficiently (with Canvas2D, we could use Canvas' ImageData for these effects but it is definitely less efficient).
For the compatibility, I would say it's getting better now, only IE is the browser which support Canvas but not WebGL.
But yes, if Canvas2d is enough for your needs, it's ok. Actually it would be interesting to inject a Canvas2d into glsl.js to add some cool effects on it :) I'm working on it!
We can really do crazy effect with GLSL, easily and efficiently (with Canvas2D, we could use Canvas' ImageData for these effects but it is definitely less efficient).
For the compatibility, I would say it's getting better now, only IE is the browser which support Canvas but not WebGL.
But yes, if Canvas2d is enough for your needs, it's ok. Actually it would be interesting to inject a Canvas2d into glsl.js to add some cool effects on it :) I'm working on it!