Let's look at it this way...and when I say championship here, I'm talking any championship, conference or national.
ACC teams that will never compete for a championship anytime soon:
BC, UNC, NC State, Pitt, Syracuse, UVA, Wake.
ACC teams on the bubble that may or may not be in contention for a championship:
Louisville (don't count in the past, but count for the future), Duke, GT, Miami, VT, Clemson, FSU
SEC teams that will never compete for a championship anytime soon:
Kentucky, Ole Miss, Miss State, Tennessee, Vandy, Arkansas
SEC teams on the bubble that may or may not be in contention for a championship:
Florida, UGA, LSU, Missouri, South Carolina, Texas A&M, Auburn, Alabama.
I think that's a pretty reasonable assessment of those teams. If you disagree, I'd like to hear your thoughts. But given my assessment, the SEC basically has one additional team that may have a chance to compete for a championship than the ACC. And again, by championship I'm talking conference or national. So realistically, the conferences on paper are fairly even. Now, I know the SEC vs ACC record on the field is slightly edged toward the SEC in recent years, but it's not big. I think this past year it was like 4-6 SEC. Not that big of a difference.
As far as the top 25 thing goes, sure, SEC has more. ACC (with the addition of Lousiville) has 4 in top 25. Again, yes, it's less than 7, but it's not a big enough difference to claim the SEC is far SUPERIOR than everyone else. They have a slight edge. They are not all Gods. Also, what are the polls really worth anyway? You almost have to take rankings with a grain of salt because they can be biased since they are based on votes by people who, believe it or not, are biased whether they claim to be or not.
I could go into Big 10/12/whatever conferences vs SEC, but I don't pay as much attention to them as I do the ACC.