The Control 24 is more of a control surface than a console while the Tascam is a digital mixer.
The Control 24 will integrate better with your HD rig though. I haven't used the Tascam but I liked the Control 24. The tascam is a hell of a lot cheaper though. It'll probably come down to either cost, the tiny details that differ between the two, and whether or not you want your audio running through the Tascam's digital mixer or would rather keep all the audio inside of PT.