It mattered in my divorce
Whoever files is the plantiff and sets the rules right off the bat by sending out the summons. I spent the first $1500 for my lawyer disputing allegations and filing a counter-claim. Also in my case, my wife moved to another state (and live there for 6 months), so when she filed the divorce, it was an Arkansas divorce eventhough we live in Mississippi the last 3 years of our marriage. It was a pain to have to drive to Arkansas to hire a lawyer, and do most of the talking back and forth on the phone.