Being that my name is
Caitlin, I'm pretty biased to pick this spelling. Even with that in mind,
Kaitlynn doesn't look as nice as
Caitlin nd
Katelyn looks like it should be Kate-Lynn, imo. If I had to pick another spelling that I like, I'd say
Kaitlin, nd I'm only picking that on an association I have with it nd it's the closest to the original spelling. All the rest are nmsaa.