GraphEx has enough graphite I don't need extra graphite.  I spend the extra money for it, it has 3 top strains of rhizobium japonicum in it that make it a superior product.

There are so many choices.  Peat was all I had 20 years ago when USDA came out, then the liquids, now all kinds.  Many seed companies have bought out inoculant companies and putting their own on.  It is least expensive to add it with the seed treatment they apply and Excalibre works as well as anything I've tried.  I like it on the seed, then a low rate of GraphEx top dressed.  Works very well for me.

I did my own research for years, you may have to do your own also.  Everyone says they have the best strains.  ABM definitely has some of the better ones because Dr. David Kuykendall discovered them.  He is one of the best in the business.

You can compare prices at www.innoculant.com

Good luck,

Ed Winkle