So far, Hellfire for me. Correct me if I'm wrong, but it has the highest damage, the best pressure, good meter-building and the best chip damage.
I could see Inferno being kinda useful against zoners, but we have a universal 21f EX teleport that goes into a full-combo + pressure, and a regular 21f teleport that guarantees roughly 8% chip.
After a BnB in Hellfire, the opponent has to guess between a 13-14% throw & a B12 xx FBC into full combo, which is meterless and + if blocked. Theoretically, they should just take the throw every time because if they guess wrong they'll be eating roughly 40%.
If you're not up to guessing after your combo, you could always just force the opponent to hold roughly 9% in chip with 214 xx Fireball Cancel - more if you use EX fireball which is +8 and does roughly 3% chip.