I used MK tracks on my Universal Carrier. Here's a pic of them in place:
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These are definately worth the money and effort, tamiya's tracks are simply horrible, and the drive sprockets have half the amount of teeth they should. MK's set fixes both the problems, as white metal sprockets are included. The track links are tiny but fit together very well. Just take your time when removing the links from the sprues. It's important to cut them off so that no excessive tension is placed on the tiny parts.
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First cut the single connectors, then clip away the U-shaped part of sprue around the lowest (in the pic above) link. Cut the lowest link loose and cut the sprue away from around the second link. (repeat as necessary) That way I didn't break a single piece of track while cutting the sprues. The tracks are then easy to assemble with liquid cement (remember to apply cement carefully as the parts are small).
I remember resicast makes both a resin update with resin tracks. The tracks look like copies of MK track lenghts. I remember reading a review of them, they're good, but they come in just long runs of track, meaning you have to bend them around sprockets and other curves.