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In my opinion, Inferno absolutely needs Dark Magic—without it, the chances of victory drop SHARPLY, even with all mass slots... Also, Attack is a must, upgrading to Mass Haste (it increases damage and is a decent spell). Luck is VERY important: 1 - It increases damage (which is the demons' main strength by birth) 2 - it improves summoning 3- most importantly—soldier luck practically adds another unit, making nightmares truly useful... The rest is a matter of preference.
I prefer Wizardry to weaken the enemy as much as possible with Dark Magic spells before it's too late (in a fair fight, the advantage is usually on the side of any other race); and also Logistics since I play Deleb. The last slot I usually leave empty to fully upgrade all others, but if the game drags on, Education or Leadership fits well there to further strengthen one of Inferno's trump cards—high initiative...
I prefer Wizardry to weaken the enemy as much as possible with Dark Magic spells before it's too late (in a fair fight, the advantage is usually on the side of any other race); and also Logistics since I play Deleb. The last slot I usually leave empty to fully upgrade all others, but if the game drags on, Education or Leadership fits well there to further strengthen one of Inferno's trump cards—high initiative...