
I have used all of these, I think there is value in every water-colorist playing with all the types. What i noticed as benefits for each type
Pan - It takes more of a toll on your brushes. The colors are more student grade level. Which to me are still beautiful. I have heard that student grade will fade more over time.
Tube - This is the one that i have played the least with. I think tubes have great color and color mixing with them is really fun.
Liquid - Is by far my favorite. I have played with dobber painting which was a really fun concept I read in a magazine. I love that i have the color ready to use i add a little water but i don't need to do as much mixing. I think it saves me time.
Keep happy, keep painting.
Thanks!
Myra Lynne Art