In my opinion, the answer is none. Mixzing has eq, Museek has gapless (basic as it may be) and Cubed has queue. Put those features in one and I'll change my answer!
My money is on Mixzing.
Lithium has a crossfader (awesome for transitions), and a queue. The only thing it doesnt have is an EQ. I tried the EQ on MixZing last week and I was not impressed so I un-installed again.
I gave Lithium a shot, but it only took one transition to know that it's not the player for me, right now. I listen to lots of concerts and albums where the tracks go into each other. Crossfading sucks for that.
I'm curious, what did you not like about the EQ in Mixzing? I didn't do a ton with it, but it seems responsive and customizable. Better than I expected.