RealTime leagues stats are heavily based on early performance and not so much on later in the year performance. What I mean is there are 32 weeks of RT play and it begins approx. 2 months after the beginning of MLB so the first few weeks of RT play are based on stats from only the first two months. As the season progresses, stats accumulate but those new stats are only averaged with the stats from the first two months still so that the stats from April and May in MLB have much more value to a player in RT than those from September.

Traditional, on the other hand, uses stats from the whole year equally.