...theoretically the home ML and -1/2 should always be the same but sometimes it differs by a small amount like with romania today
I could be wrong, but my background in math leads me to believe that the juice built in to each wager type for the house is the same. As a result, the juice is split evenly for the -.5/+.5 line. Whereas, it's distributed in 3 pieces for the 3 way line. Therefore, it's typically a better price on the favorite in the 3 way line due to paying less juice.