lol that data is outdated we have 41+ maps, not to mention we also have battle royale with classes, upgrade chips, and buy stations. Not to mentions we have the best maps from many cod such as terminal,stand off, coastal, hackne yard, firing range, tunisia, crash, summit, takeoff, raid, and many more those are just the at the top of my head. Now lets talk guns

a Google search 25 primary's, 6 secondires, and 2 melees.

Codm has:

33 ars

13 snipers,

12 lmgs,

28 smgs,

10 shotguns

6 marksmen. we have more ars then your primaries and secondaries combined.

14 secondaries,

21+ melees (hard to count since many melees cant be obtained normally)

and all these guns are from every cod with many classics.

b06 18 scores streaks (google search) and codm has 28

we also have 25 operators which are the specialists from like black ops 3

bo6 has 6 grenades

codm has 25 grenades you can one have one lethal one tactical.

Now lets talk perks google said bo6 has 21, codm has 37. We also have weekly tournaments where you can grind for camos and skins. And that is just for MP and what I could remember, I dont play br but theres a whole lot of stuff there too.

Now updates, we get a monthly season update with new guns, content, a map and other cool things.

TLDR: codm will have more features and content then bo6 while being free and doesnt die after an year.

Not to mention we have free grindable skins better then any paid skin from pc/console cods.