I have the light green non-fuzzy kind. They're lobed with lengthwise grooves.
I have my cukes growing in two separate plots, and that turned out to be a good idea. One plot was completely overrun with aphids. The other plot still has none. There were hundreds per leaf!
I didn't notice it for a few days, and when I did the cavalry was already arriving. I now have 2-3 ladybugs on each leaf, feasting on the aphids. Gotta love nature!