Thanks for your reply!

I think earning miles is most important for me now

Right now i'm actually modelling everything in Excel so I can compute exactly what the best option would be. I ll post this model when i'm done, so that others may be able to use it!

One more question. Is the codeshare trick valid? As in, if i book a flight under a codeshare that gives me a higher percentage of miles earned for a particular FFP, will they honor that? Or only look at the actual operating carrier?