How I Play a Demonology vs. Affliction Warlock

A lot of people has stated that affliction leveling is best with a warlock.  i am not sure why, as i do not think people play as i play. Sure, my corruption ticks for a little more, but my pet sucks balls compared to demonology.  destruction is as boring as... well, mage leveling without evocation.

So what is the difference between affliction and demonogy exactly?
Besides the different spells they both have?

- Demonologists have stronger pets, has some procs, and a transformation once ever few minutes.

- Afflictionists have stronger Corruption, two more DoTs, possibly another curse (of exhaustion), and more efficient lifetaps, howl of terror, and darkpact (you know, those things you might need if your pet isnt cutting it, or if you're not using the pet at all, which makes complete sense).

This is how i play my Demonology Warlock while questing.
1. Use felguard (or voidwalker before lv.50).  send him in.  wait a second for him to get some aggro.
2. Add the following spells: Immolate, Corruption, Curse of my choice, Shadowbolt if mob has lots of health, drain soul if mob has less than 25% health.
3. Shadowbolt if Nightfall procs; Incinerate if Molton Core procs. 
4. Check cooldowns for spellstones. tap when necessary.

thats it.  easy huh?

This is how i play my Affliction Warlock while questing.
Single Target:
1. Use Felhound/felhunter.  Imp before that.  Voidwalker if mob hits hard.
2. Add the following spells:  Haunt, Corruption, Curse of my choice, Unstable Affliction. Refresh when theyre down.
3. Fear
4. Lifetap twice before Haunt finishes.
5. Shadowbolt if Nightfall procs
6. Drain soul when mob is below 25% health.

Multiple Targets:
1. Use imp, leave on passive.
2. First mob: Haunt, corruption, curse of agony.
3. Second mob: corruption, curse
4. Third mob: corruption, curse.
5. Fourth mob: corruption, curse
6. HOWL OF TERROR
7. Fear mob #4
8. Lifetap/darkpact
9. target mob 1, refresh dots (drain soul til dead)
10. target mob 2, haunt. refresh dots (drain soul til dead)
11. target mob 3, refresh dots (drain sould til dead)
12. mob 4 should be coming out of fear now.  refresh dot and drain soul til dead.

note:  lifetap and dark pact takes your life and gives you mana.  imp is your mana battery.  your spells, haunt and corruption gives you life back.  this allows you to lifetap endlessly.  drain soul will return 15% of your mana.  so its okay to not lifetap in steps 9 through 12.

Have fun.  good luck.  and be prepared to die a few times getting all this right.