For what it's worth, I have a few feeders up with different kinds of
seed. The black oil sunflower feeder is bar far the most popular,
attracting seed eaters both on the feeder and below. Suet is
predictably popular and gets 4 species of woodpeckers on some days
along with a wide variety of passerines.

Farther away from the house I have a feeder which gets Tractor
Supply's "Value Mix' bird food which contains a mix of "milo, white
millet, cracked corn, wheat, black oil sunflower." This feeder gets
more action from the towhees and song sparrows than the sunflower only
feeder. The mix is fairly heavy on the milo, but it seems to mostly
get eaten as there is a fairly small amount of uneaten milo on the
ground below.

My least used feeders are the ones containing nyger (aka thistle)
seed. I'll see an occasional junco taking a bite, but it has failed to
attract the neighborhood finches in the 8 months we've lived here. At
my previous house I only got goldfinches as the nyger feeder in
spring, so perhaps that trend will continue.

If you live near a Tractor Supply, they have the best prices I've ever
seen for bird food. Black oil sunflower is $19 for 40lbs and often on
sale for a few bucks less. Their "value mix" is $9 for 35lbs and
contains a surprisingly high percentage of black oil sunflower seed
considering the price.

Josh Adams
Cathcart, WA