^^ you can also use photoshop if you like. most people will say that photoshop is a bit too scary and overfeatured for pixelart, but if you are already confortable with it, then there's no reason why you can't use it. you just have to set the tools right.
some others may be better for some things, like managing a palette or tile work, but, as long as you can place a pixel of the color your want, where you want it, you are good to go.