I'm actually facing a similar issue.
Currently I have around 28k AY points (although the website only lists 3 flights and around 8k points? I wonder where the rest is coming from)
I also have around 6k SAS points, and an Eurobonus Diners club.
What prompted this inquiry, was the change to the Diners club-rules which makes me only collect Eurobonus-points. I don't know if this is a good thing, though.
My flying habits: Around 10-15 return flights in the Nordics per year (work-related, homebase is Helsinki) and then 2-3 personal flights around Europe or intercontinental. Lounge access is nice, but I also like the points. I don't care so much for "status" or the supposed better treatment you receive with it.
Which program gives me the most bang for the point? I would get 2 points per euro on the Diners Club with Finnair, but if those are worth less than half of eurobonus-points...
Thanks for the help!