In Indiana Thomas Jefferson certainly has the most competitive history at nationals - but they don't bring their A-game to state! Bachelor beat them at state the year they got 3rd or 4th at Nationals (and Bachelor got 30-something!). When TJ has a smaller margin of victory at state they usually totally blow the other team out of the water at nationals anyhow.
I think the C div is actually MUCH more historically competitive in Indiana in that the 2nd place team is much more viable at nationals than our 2nd place B div teams have usually been. Indiana has been putting 2 high schools in the top 20 most years since 1998 or so. There are 4 high schools in Indiana that have managed high-ish national ranks in the past 10 years: Bloomington North -10th, Bloomington South and Valpo (3 times for Valpo!) - 11th, and Carmel has been nearly as high at some point (14-15 perhaps???... my knowledge is better for the teams that peaked just recently or when I was still a competitor). And MANY schools consistently compete at nearly that level: most notably Riley, Munster, and North Central. So while there might not be any school of TJ's star quality, the C div has 7 or 8 schools that are much stronger than any B div program other than TJ.
Our B Division has suffered from a wicked atrophy. First the Carmel Clay program expired, then the Tri-North team died (Bloomington North), then the Bachelor team (Bloomington South)... both Bloomington programs revived but were pushed back a LOT by the loss of a team and lack of experienced volunteers/coaches. Recently the Ben Franklin program seems to have weakened significantly also. I think we have trouble retaining the strong B division programs because they're so much more ADULT driven. Without good staff and faculty it's difficult to create or sustain a strong B div team. The kids can make it happen without much support in the C Div if necessary. So as people retire/burn out/etc. we tend to lose B div teams. I guess if that theory is true the B Div should be less competitive everywhere because there would generally be less strong B div teams.