I prefer a plain blade that doesn't require too much maintenance. I realise though that carbon steel is often preferred in longer blades. Damascus is great looking but I would prefer a lower maintenance (and priced) steel. I guess hand forged is really cool. It doesn't have to have a hamon.
As for handle materials, that's a tricky one. I guess in a traditional bowie staghorn or wood is best. I would be happy with a good strong stabilised wood. I like curly maple and desert ironwood for sure.
As for length, I have two Trailmasters and find the 9 inch blade to be a good size. OAL is about 15 inches?
I like a decent size guard but it doesnt have to be anything like the guard on the HB. I think I prefer the long clip as seen on the Bagwell's to a shorter clip, and a narrower blade.