Staraptor can have access to Brave Bird, a powerful Flying type Stab and has Agility along wiht Close combat to deal with Ice and Rock types but Landorus T has better attack, bulk, type, and access many good move like Swords Dance, Earthquake Stone Edge and Outrage and does a better job with U-turn. Landorous can also mix sweep to screw physical wall
If you want something that require more skill to use of a good flying type that is not a legend, use Staraptor. If you want a good flying type that isn't easily one shoted off the bat by faster sweep, use Landorus T. Beware for Ice shards for it can sweep those two pokemon if you are not careful.
I disagree. Staraptors extra speed allows it to slip out if situations Landorus would be stuck in. Sure Landorus' U-Turn may hit harder but U-Turn is all about setting up for the following turn and that extra speed goes a long way. --- Proud member of Team Galactic; I'm a G. The creator of new universe - Team Galactic Commander, Neo Angel