I credited all my DL miles to KLM FB last year. Because FB credits 50%/25% for cheap DL tickets, I lost a lot of miles I could have redeemed. So guess I should get some advice

(1) What is your home airport? JFK
(2) What types of fares do you usually buy? Cheapest economy. K, U, T...
(3) How many miles do you usually fly each year? 80K last year.
(4) Do you have any kind of status at present? What is it? KLM Silver
(5) What is most important to you in a FFP? Dreaming about buying a crazy multi-leg route with miles.
(6) Which routes do you fly most often: Every month JFK-SFO, twice a year JFK-HEL-IST-JFK.
(7) Preferred Airlines: DL is usually cheaper
(8) Do you travel for work or pleasure? Freelance work, pay for the tickets myself, thus getting the cheap ones


Depending on this I will choose with whom I'll fly this year. Torn between DL and UA. Thanks already