What is your criteria for
best?
Look at
www.wheretocredit.com for redeemable miles earning. Status earning is not so simple
You need to know the fare booking class (not the cabin). Some low cost fares can earn nil ff miles. If any flights are codeshare that can be a complication to ff earning.
What ffp's are you a member of now?
One trip is not a sound basis to select a ffp. Extremely unlikely 1 super cheap trip will get status. If you did 10 super cheap trips maybe.
DL has Virgin Atlantic VS as a
ff partner
Alaska AS has DL, AF & KLM as ff partners. AS will soon take over Virgin America, a Virgin Atlantic partner. So in time you could have AS ff miles, subject to eligible flights.
http://www.flyertalk.com/forum/infor...help-here.html
http://www.flyertalk.com/forum/skyte...i-sign-up.html
http://www.skyteam.com/en