Actually if I consider them from the previous few seasons, then I can conclude that Betis is still the better one compared to Bilbao. Because from the previous few seasons it was very difficult for Bilbao to break into the top six, because usually Bilbao only struggles in the middle of the standings, for example in positions eight to eleven.
In contrast to Betis, they have been impressive in the last few seasons, because Betis can consistently compete in the top six.
So yes, if I consider their position from the past few seasons then I would go for Betis but unfortunately, at this moment even though they are level on points I consider that Bilbao have a better chance of winning. Even the record for home and away matches so far this season in fact Bilbao looks better and thus, I doubt the quality of Betis at this moment.
Assessment of their performance from the previous few seasons did not impress me with Betis this season because after all, this season seems to be very different for Betis, whose consistency seems to be doubtful.