I was reading an older edition of Design for Hackers last night and there was a statement that hsl was the latest and greatest due to its easier use compared to hex and it got me thinking...I almost always use rgba, and never really gave it a second thought.
So do you prefer to use hex, rgba, hsla, or mix them? Why?
HSL is definitely the most useful when building a palette; start with your base color, then just tweak the saturation and lightness as needed to build off of that.