Hmmm.
The IRT is a game. Your aim is to win the game and follow its little rules. You can make the game easier or harder for yourself in many ways. I suggest it is nothing more than gamesmanship to give yourself every advantage and make things as easy as possible for yourself on the day.
A light twin is a light twin. I've never heard of anyone being wowed by a Baron and there are very few in GA service. An Aztruck might be a more useful type to train and have on your license.
Cheers
WWW