I guess it's just a matter of personal choice. I like using the three line system with a fuel dot. I've never had any problem with losing a fuel dot. I refuse to use a kwik filler fuel valve because they are IMO junk! I can see where the 2 line with a loop on the outside would function very well, but not nearly as clean looking to me as a nice fuel dot is. So I guess it just boils down to what you like personally.