CoD black ops 2 or CoD ghosts

Bo2 for sure.
I bough Ghosts and only played 2matches and almost broke the CD.

Both are completly different because of different developing teams. Black Ops II has more people online usually (you can check steamcharts) however I enjoyed Ghosts more. It is about preference and Ghosts had a rough start so many people hate it.

As someone who never played CoDs: people say Ghosts is worst CoD ever.

Also, from what I seen Black Ops 2 is most popular from Steam's CoDs, while there's no Ghost on Steam's-most-played-games list right now.

Ohhh it wasn't a puzzle?
Sorry never played them. Can't answer.
(this is a bump)

Ghosts for single-player story and Extinction mode only. Wasted more than 450h on Multiplayer, so I know what I'm talking about. I've never played BO1/2, so no comments. Really enjoyed BO3 Beta though.

Definitely Black Ops II. It's much more refined, and a much better port for PC. Ghosts wasn't such a great port, and the multiplayer was to shallow for me, along with that being a pretty crappy port.

BO2 anyday, Ghosts has an awful multiplayer, extinction which is boring asf and an ok Campaign.
BO2 on the other hand has zombies which is superb, fun multiplayer and a great campaign.

Black Ops II of course

Ghosts is horrible. The spawn system is broken af. You kill someone and he can immediately spawn behind you.
Also you die in like 4 hits which takes out the fun of rushing and encourages camping.
BO2 on the other hand is pretty solid. There are some weapons which are ridiculously strong, though.

I would recommend BO1. I had the most fun with that CoD since there are few OP guns and the maps are great.