Which alternate upgrade for Inferno do you like the most?

Level 1: Imps or Devilings (depending on my hero's mana). Level 2: No question, Elder Demons (I was horrified when they flew to me for the first time). Level 3: New hounds are super (I think it's a bit unfair). Level 4: Succubi. Level 5: Hellhounds. Level 6: Cave Lords. Level 7: Archdevils. The alternate upgrade completely changed the strategy for playing as Inferno. From what's written above, it's clear that I only take Imps (and not always) and units from levels 6 and 7 from the old list.