My first Final Fantasy game was Lightning's game. That had combat system I never seen in an RPG. Yeah, I definitely check this one out.
Knights of Sidonia is mech horror show. It has a lot of similarities to Attack on Titan. Unlike Attack on Titan, Knights of Sidonia is an underrated series that has better pacing that AOT. It has the same issues with similar face syndrome. It's completely CG and doesn't hold back on the gore and violence. I wished it was animated not CG. The author is an architect, so his buildings and landscape in the manga are breathtaking detailed. You won't see that in the anime unfortunately.
Unlike AOT, Knights of Sidonia has a bit more fan service, more panties. There are no Gainax or big jugs. Also, expect a talking bear.