Betis - Barcelona is such an interesting match that both of them can be the winner at the end of it. Because Betis are also one of the teams that are having an incredible season. This is their biggest success in the La Liga for so many years. And they still have a chance for even joining the Champions League. They mustn't turn this opportunity down that easy. As Atletico Madrid also have a very difficult match against Real Madrid, I think Betis have a big opportunity to catch up with them maybe. I'm just thinking of betting on both teams to score and enjoy the match. 
Betis are mentally playing pretty well actually. they just managed to win the Copa del Rey after beating Valencia on penalties.but in the League, Betis' performance has not been good in the last 3 games without a win. against Barcelona, I believe it will be a draw for both teams.