Based on both cars right now I would have to give the 3.0 the choice. Both cars are really good and with the right setup you will be happy, I will say I only broke 1 front arm on the b5m in the year I've had it. Ive had the 3.0 for 5 race days already and broke a ball stud on the last 2 occasions. Id say the b5m is a bit more durable.