Here's my 4 cents.....
Diamonds & ceramic are pretty much what I have used for the last couple of decades or so.
Before diamonds became popular it was natural stones of course,but I prefer diamonds for their durability or wear resistance.
Meaning they don't develop the dishing that a natural stone will wear into after prolonged use.
I also have one of the cheap 4 sided diamond blocks that works great for removing dings or knocking down too steep shoulders on an edge.(I prefer a thinner edge)It has 200-600 grit plates & after the 200 I use a ceramic rod or the cone in the first pic for the final paper shaving edge.I also have some of the little paddle types from ezlap that are great for throwing into a pack/bag.They range from 1200-150 grit,all you'd need to maintain an edge in the field.I used it on my HBXL last Memorial Day weekend.
Before ceramic rods came out I used plain leather,usually the side of my boot or my belt for the final edge.
When I was a kid we(my adopted father,brother & I) sharpened our knives on a 2 sided stone by spitting on it & pushing the blade around in a circle or oval pattern.I wouldn't think of doing it now,but it worked.
That stone had the dish from wear,but like I said,it worked fine for our pocket knives.
Thinking about it,I guess we were actually putting a slight convexed edge on our knives with that old stone.
Now days I can get a nice edge without the spit & get it much quicker with diamonds & ceramic.
That's one of the things I like about diamonds,no oil or spit is needed to keep the pores of the stone open for optimal performance.Just dump the dust off in the trash or rinse them off after use.
I lucked out on the ceramic cone in the first pic.It came off a sand blaster & was the inner nozzle where the blasting media came out.Very wear resistant stuff!
It is the best touch up sharpener I have.A few licks on it and a dull blade is paper shaving again.
Notice I said paper & not hair shaving,I got tired of bald spots on my arms,it's bad enough my head is bald,I don't need bald arms too.
I did make a strop recently & bought a package of different rouges to try out,but have been hesitant because I don't need another step in my sharpening process & don't really need a polished edge either.(I'm lazy like that,the less work the better)