Yugioh related question. During standby phase, both players have special summons. Who goes?

Title says it all.I was playing a friend with my Fire Kings, had High Avatar, he had a Blue Eyes Dragon Deck. He had a special summon in standby phas

Title says it all.

I was playing a friend with my Fire Kings, had High Avatar, he had a Blue Eyes Dragon Deck. He had a special summon in standby phase as did I, who gets to choose the special summoning process?

or:Title says it all.I was playing a friend with my Fire Kings, had High Avatar, he had a Blue Eyes Dragon Deck. He had a special summon in standby phase as did I, who gets to choose the special summoning process?

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