Overall I tend to be a very practical person. Probably too many years in the military, and too many years as a mountain guide which have forced me to be practical. I tend to prefer lightweight and strong materials, and materials that are very low maintenance.
For certain situations I prefer stainless steels (I know, shocking!) in a knife. I prefer G-10 for a handle material because it's light, strong and zero maintenance, or a Mora because it's light with a plastic handle, many of the sheaths are small and light and it works (I think my Spyderco Bushcraft is beautiful with it's spalted maple handle, but if it fails I'm going to find someone who can do 3-D G-10 or fat micarta handles).
Speed and ease of use are very important if you're hypothermic, injured, tired, etc.
I carry a modified and brightly colored disposable lighter (550 cord loop on the bottom secured by a few feet of blaze orange duct tape, and the gas regulator is modified to put out big flames) because it's light, cheap and relatively reliable and will be my first choice of fire starting in a real emergency. I carry a plastic handled or no handled ferro rod because it offers me hundreds of fires and serves as my back up. I carry pjcb because it works better and longer than char clothe, minus the romanticism.
I like having a headlamp with me because it's practical, fast and doing first aid in the dark sucks.
I carry energy bars and Gu because I know I don't NEED it but I know that I make better decisions, think more clearly and my motor skills are better when I'm not distracted by hunger and lack of energy. I've been in enough bad situations where I was food and sleep deprived that I know the importance of food for me.
I carry a titanium cup because it's light and strong and so I don't mind carrying it and I know from a lot of experimentation that other methods of boiling water (foil, muffin tins, hot rock boiling, etc.) are inferior, slower and more difficult. I need to get a Klean Kanteen.
Making cordage in the wild is slow and difficult for me. I suck at it and I need to practice it a lot more. I carry 550 cord because it gives me more bang for my buck with 8 strands of cordage in one. I also carry jute twine because it's strong enough and works as a very effective fire starter with my ferro rod.
I commit as much knowledge to memory (which only works for me if I practice it enough times. Apparently I'm a slow learner!) as I know knowledge weighs nothing. But I also carry cheat sheets because I know how my brain works at altitude and when I haven't eaten for several days or when I'm in intense pain (broken back, dislocated knee, shattered hand and wrist, broken shoulder with severed tendons, etc. etc. etc.).
I like the romantic idea of antler, buckskin, flint and steel, etc. but I know what's important when the chips are down and I'll go for modern, light, fast and effective every time.