General consensus is that the analog meter is better... simply because you can see minor movement in the signal and better gage if the signal is moving up or down. And the analog meter is about $10-$15 cheaper. I would check to see if you can buy the analog meter through Radio Shack's website.
I, too, have the Digital unit. I would think that the analog would be a bit more precise when splitting hairs...but do not find it to be a problem when calibtaing my set ups.