The non-Schengen lounge at Barcelona Airport has a huge plus over its Schengen counterpart - it has a pool room, cinema, a better bar, and even a golf driving range.
There are three lounges you can access airside at Barcelona, but you need to make a decision about which one to go to before going airside.
None of these lounges are directly run by Iberia: instead, Aena own them, and make a few quid on the side from those who don't have the right frequent flyer card. If you need to, you can access all the lounges by paying a 25 euro fee.