I tend to like 8-15 minute tunes that are tight and connected. Sometimes the long epics are too long. An exception is CTTE - it's fascinating all the way through.
For SB, I like "At The End Of The Day" - I get more pleasure out of that than the great zero
.
Discipline's "Canto IV" is powerful and marvelous at 13 minutes. I like Epics I can be excited all the way through.
OK, now to finally answer the question...parts like the passage in "Thick" where Ian says "You put your bet on # 1 and it comes up every time". The instrumental interplay is great.
My favorite "Epic" has to be "Stardust We Are". Nowhere in that tune do I see a section that's overlong, unneeded, or bloated.