I would use the Alfalfa Pellets. But I'm cheap and there is nothing wrong with variety. I've been using mainly cracked corn this year because it's slightly cheaper then the Alfalfa and the SBM. I've also been using used coffee ground because those of course are free.

Since soybean meal is so expensive, I would suggest an alternative. Safe and Simple lawn food is composed of soybean meal, alfalfa meal and fish meal and sells for $23.99 per 50 lb bag. There is a dealer look up on the site.

Here is a link that might be useful: useful link

You get a little more than twice as much N with SBM. If the price was the same per N i would opt for Alfalfa because you get more "stuff" and it is easier to spread.