I'm going to get one or the other. pros / cons? Alternatives I've not thought of?
I've never tried a Fjellkniven but I do have a Eggen which I rate highly.
Have you seen some of these threads?
http://www.bushcraftuk.com/forum/showthread.php?t=30532&highlight=eggen+brakar
http://www.bushcraftuk.com/forum/showthread.php?t=28804&highlight=eggen+brakar
http://www.bushcraftuk.com/forum/showthread.php?t=16071&highlight=eggen+brakar
TBH Helle make good knifes and I wouldn't think you would be too disappointed whatever one you ended up choosing (just don't expect to get a spark off the spine )