Based on the questions you have asked here... and taking into account that you need muliplayer functionality... get commercial. It is the lowest-priced engine that has multiplayer support (200$). I would recomend extra, but if multiplayer is really your thing, then commercial is, at minimum, what you need to get.
Regards, Raddaddy
"Read not to contradict and confute, nor to find talk and discourse, but to weigh and consider." Sir Francis Bacon
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