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Simple question. You've won the coin flip. Do you want to go first, or do you want your opponent to go first? I always defer and have my opponent go first so I can do the first attack.
Really depends what sort of deck you're playing against and what sort of deck you're playing. My friend plays item lock trevanant a lot, I'm Mega Manetric/Regice, so I choose to go first to hopefully use some items if he get's wally/phantump