FD is the 8th generation of civics and FB is the 9th generation.
FB has Honda i-MID, USB, Multi-link Suspension , Projector Headlamps over the old FD series. Also different styling.
But IMO double Wishbone suspension in FD is considered superior than the multi-link
And FD has unique styling.
They say the FD series Typer R (FD2R) is the last real NA Typer R!
Also the 8th generation dashboard is just beautiful.