As RJ said, a lot of this is personal preference. If you have a specific purpose for some of your LE's, you can even create fixed lengths right out of the LE to match the need. Those are very nice cords indeed, and a good price too. But for my needs (low draw LEDs), I just went for the $.79 6' extensions at Lowes. Most everything I have is a two wire plug, so the extra weight and heft of grounded outlet cords just didn't justify the higher cost for me. Technically these are "indoor" cords, but I have used them outside for many years with incandescent lights (higher current draw) in the hot FL sun with no problems...they get get stiff after a couple of years, but I have never had one crack, etc.
Mike E.