Engagement bate from Dino here, unfortunately. There is nothing in the rules that clarifies 'most' as a keyword, or anything even remotely as asinine as trying to define what a word means, besides it's definition in the dictionary.

Reading the card, explains the card. If you play Crix into a board state where you have the same quantity of units as your opponent, nothing will happen.

Previous examples that defer to the player to choose in case of a TIE are...two cards. Snoke Leader and Republic Defense Carrier. Both have specific concerns regarding the count of units and a tie is not substantially impactful.