Altho I haven't tried K-Meleon I looked at the screen shots and prefer to stick with SeaMonkey Portable.
I would like to speak up for SeaMonkey Portable--
-you can easily move or copy the entire folder anywhere; another drive, OS, or wherever,
-you can make 1 or 2 backup copies in case the main copy gets goofed,
-it gives you a built-in Desktop email server,
-as of this post it is actively supported by its creators,
-unlike Chrome, I can easily change background color to off-white and save my eyes from e-'snow blindness', or switch to white when the website requires it.