And the search function for all those little things I want to get more general information about.
Also, as mentioned by others, there is tons of history on "history" pages of that wiki.
For Systems/Stations/Planets/Ships for Information/historical information and how they look. All these pages are mostly up to date.
Then the Commodity page(s) because you get a quick overview what you need for a POB and where you get it, what you can mine where and where to sell it or what is contraband. The latter is not always up to date and/or accurate though
NPC's Faction pages are outdated when it comes to the storyline and diplomacy, but i still use them just for the nostalgia.
I also use the Server commands, Restart Guide and ID pages from time to time. Mostly because of fast access.
What i don't use are the equipment pages, because the Wiki and its design has no real advantage over FLStat there. Pictures of a Gun or how the projectile looks is not that important to me for example. Don't know when i last visited one of these pages looking for information.
tl:dr:
Most frequently used: Systems, Stations, Planets, Ships and Commodity pages.
Sometimes in use: NPC's Faction, Server commands, Restart Guide and ID pages
Mostly Ships and their locations and stats, sometimes I'm reading infocards, searching for commodities. I used it a lot when I started to read through all the ID's and Server Commands and I like that People are working on it.
Primarily, I use the wiki to look at ship and weapon stats. These were all updated a few months ago, but a few changes have taken place since then, rendering most fighter ship power cores as incorrect. Nine times out of ten, I use a work computer to check these stats. s I cannot refer to FL Stat on a work computer, sometimes I'm left scratching my head as to whether or not information is accurate.
Even on a home computer when I have access to FLStat, I still prefer to use the wiki. The way information is crammed together and presented on FLStat usually has me squinting and running a finger across my monitor to ensure I'm not mixing up stat lines.
Tangent: If FLStat had alternating white/light grey data lines, it would probably make it 100% easier to read.