Having just flown BCN-DOH-DPS in N class of Economy, I am wondering whether its better to open a new Avios Account on QR or just credit them to my Marco Polo of Cathay Pacific (where I get 5 Club points and 755 miles..! (BCN-DOH)).

Probably be flying more QR than CX over the next few years, but cannot find any info on how many miles I would earn on Qatar with those (completed) flights)