I don't know which guide is which, but the one I use is the one where I can see a grid of what's on all at once, instead of seeing a list of the programs on only one channel at a time.

The reason I prefer the grid is because it's easier to read, easier to see what's on "right now" for large groups of channels, and requires less brain work to make a decision about what to watch.

I agree that the other list guide is much faster, and I definitely use that when I'm trying to find a specific program to record.