Long franchise in the sense of confusing start point at this point, because their names are like ∆, frontier, iron blood, and what not. And long in the sense that its been around since the 80s and I am not in the mood for something old.

Also if the anime has like 5 movies then I'd also reconsider starting it because the commitment of a movie is bigger, but as stated I have already seen nge (and the rebuild and eoe and d&r).