Looking for the general accepted way to bet on baseball

i know with football and basketball you bet units to win. ie 10 units on an nfl game. if you win, u win 10 units, if you lose, you lose 11 units since just about all nfl bets are set at -110.

With baseball, and for counting units, if i throw 10 units on a baseball game, is it typical to throw the units on To Win, or To Play. Here's an example:

NYY/BOS Under 9 runs set at -115

Bet to win 10 units will result in either winning 10 units or losing 11.5 units

Bet to play 10 units will result in either winning 8.7 units or losing 10 units

so in everyone's opinion, what the accepted way to bet on baseball?