I would say the Empire of Man series by Weber and John Ringo.
It's all about a military unit devising plans, overcoming adversity, killing bad guys, being thrown into uncertain situations, etc. Lots of talk about battle strategy, weapons, etc. There isn't much politics as the books stay with the company throughout.
For me, the core element of being military scifi is basically that is focuses on the soldiers. Instead of the Gov't saying "send in the marines, now lets talk about our trade policy", we get it from the marine's view of "okay, we're going in and this how we're going to get it done".
EDIT: i don't know if its hands-down best but its very good and its the first that pops into my mind when i hear "military scifi".
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