Following on from Tuesday's post which compared Unipin and Micron pens, here's a follow-up test.
This time I've drawn the same boxes, but I first drew pencil outlines. I then went over the pencil lines with the pens, let the ink dry for an hour and erased the pencil. The test was suggested by Del Teigler in the Google+ comments for the post. It makes quite a lot of sense as many maps will be drawn in ink over a pencil outline.
The results were similar to the first test, but I think the Micron pens have done a better job of covering the pencil. On some of the boxes drawn with the Unipin pens there seems to be some shine coming though from the pencil (probably made worse by the scanner).
I think overall the Microns are the better pens. In the UK they are slightly more expensive than the Unipins, which may be an issue if you're a heavy user. I hope to review some more pens and pencils in the future, and possibly some other stationery items too.