For me, there is none.
Last year was my first playing the game. I did the collection. Got no real benefits for it.
This year, I need stubs to make the LS Collection, so I sell every items I pull.
The only benefit I see from collecting uniforms, is that you can wear them in the game if you like them. But since you can only wear one uniform per game, I don't see the thrill of collection 400+ jerseys to get like 10 000 stubs as reward.
My advice: sold your items, keep these stubs and buy the cards you need instead of packs.
It is just my two cents. Hope it helps, though.
