It's difficult to say which is more intense because the "dosages" are all different. If you keep dosage constant (i.e. ingest 30mg DMT vs. smoke 30mg DMT) my guess is that smoking it will be more intense practically every time provided you have good vaping technique. If you're looking to push the envelope, smoking DMT at the peak of an aya trip is clearly the most intense thing you can probably do in your life and survive
...that and maybe smoking 5-MeO DMT.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb