Looking at the videos of each technique on this site, it appears that Intarsia yields a clean back (assumin that one changes colors but once or twice per row); whereas, Fair Isla (Stranding) yields a very busy, messy back side. Am I confused?
No, Lando you’re pretty right. Fair Isle CNA be done to look very neat, but there will always be a definite “wrong side” to anything knit with that method. It’s good for tubular things like sweaters, hats, gloves, tea cozies, socks… A scarf with fair isle, on the other hand, will definitly show right and wrong sides.
Sometimes intarsia can look messy, especially if you have lots of colors. For a single stripe, though, it might look ok–not exactly like the front because you’ll see the twisted stitches on the edge, but otherwise it should be ok.
Thanks to everyone for the suggestions and examples. I need to get this scarf done for Xmas gift, but will start an Intarsia 2-color version as soon as this one is done.
If you want a scarf with vertical stripes you could knit it “sideways” or the long ways. For example you would cast on a large number of stitches, depending on your gauge, and you could knit 5 rows with one color, knit the next 5 with another color, etc.