We are trying to score some C seats to TPE using miles. What are the best choices, in terms of...
A. Ease of obtaining miles?
B. Ease of finding award seats? (on that carrier or a partner)
C. Quality would break any ties, but isn't the primary consideration.

Because I know I'll be asked, we currently have...
120k miles on NW
40k miles (in two accounts) on AA
almost 50k miles on UA
30k miles on DL
...and some other small pockets here and there. I know many people will look at that list and say it's a no-brainer to go with NW...but AA miles are a lot easier to obtain (through CCs).

Our home airport (LSE) is only served by NW & AA, so obviously we would prefer to start out from here, but other major airports aren't so far away, so pretty much any alliance is possible. Thanks!