Re: Let's compare
After all that build-up that's a pretty weak conclusion.
If you look at your list again you'll see that none of Demogorgon's attacks are very effective against Asmodeus while he has a decent hp total, while he can do 32 dmg/round acid damage to Demogorgon (assuming Demo saves), twice that if hasted. Assuming no use of lesser god abilities Asmodeus would seem to have the advantage on 1e stats. If they start summoning allies 1e pit fiends are a lot nastier than any 1e demons, although Type V/Mariliths get a decent number of attacks.
Vaercathor Deathknel said:As 1e gives us the only real means of comparison, let's use that:
Demogorgon and Asmodeus are Lesser Gods (DDG p.90).
Armour Class: Asmodeus has a -7 AC vs. Demogorgon's -8.
Hit Points: Asmodeus has 199 hp vs. Demogorgon's 200.
Physical Attacks: Asmodeus has one attack for 4-14 damage vs.
Demogorgon's 3 attacks for 1-6 for each tentacle while his tail drains 1d4 levels.
Magic Resistance: Asmodeus has 90% vs. Demogorgon's 95%.
Special Mentions:
Asmodeus can fly, is as strong as a storm giant, and can use the following abilities; wall of fire, ice storm, wall of ice, detect invisible, invisibility, dispel magic, hold monster, shape change, beguile, rulership, geas, symbols of pain, insanity, and hopelessness, unholy word, summon 2 greater devils (we'll assume pit fiends). His gaze causes fear, weakness, or chill. Also his rod has the effects of dragon's breath.
Demogorgon can hypnotize, beguile, insanity, detect invisible, dispel magic, polymorph self, wall of ice, telekinese, feeblemind, project image, power word stun, any symbol, gating in a random demon.
Too close, it would depend on if they were played to their fullest potential.
After all that build-up that's a pretty weak conclusion.

If you look at your list again you'll see that none of Demogorgon's attacks are very effective against Asmodeus while he has a decent hp total, while he can do 32 dmg/round acid damage to Demogorgon (assuming Demo saves), twice that if hasted. Assuming no use of lesser god abilities Asmodeus would seem to have the advantage on 1e stats. If they start summoning allies 1e pit fiends are a lot nastier than any 1e demons, although Type V/Mariliths get a decent number of attacks.