It should be the admin's decision, not the players'. When this is left up to the players, there is the possibility that they will make an altruistic decision to be respectful to the other team. There was this incident a few weeks ago when some team was to decide if it was okay to play on NA (or if it was EU, the other server in any case) because the other team was getting lag or whatever. The team went with the tournament rules and still got shit from a lot of people because they weren't "nice". I can see a similar situation here.