I think Deportivo will win it this year but they'll struggle to be as successful next year, look at Mallorca.
The reason is because I'm not sure if Deportivo can keep hold of all their big players and be successful in La Liga while playing in the Champions' League.
Barca can rotate their squad every game and still have a quality line up. Deportivo can't really do that. However, I hope I'm wrong! I hope Deportivo invest in a couple of world class players in the summer and challenge for La Liga next season.