I compared combat and illusion area spells. Essential differences are:
1. You need to sustain area illusion spells
2. Indirect combat area spells need high force.
3. It is possible to use illusion spells with reagents, radius is small.
4. Area combat spells give synergies to stun bolt and clout.
If you do it right the effect is almost the same for both strategies.
Combat spells:
Spellcasting 6
Charisma 8
Willpower 5 (+4)
Magic 7
Power focus 4
Compat spell specialization 2
Mentor spirit 2
Centering 2
Sustaining focus 5 (health)
Force 7 fetish ball lightning
Total: 21 dices: On average damage is 11P with -7AP. Additional electricity damage.
Drain: 4, dicepool 19
Damage against elite soldier (19 dices): 7P. => -3 to actions with electricity penalty, -5 to initiative
Opium den:
Spellcasting 6
Charisma 8
Willpower 5
Magic 7
Power focus 4
Illusion spell specialization 2
Mentor spirit 2
Centering 2
Sustaining focus 5 (illusion)
Force 5 fetish opium den
Total: 21 dices: On average 7 hits.
Drain: 2, dicepool 15
Effect against elite soldier (10 dices): -4 to all actions.
If you cannot avoid area illusion spells by using run for your life, they are better. Otherwise quite similar.
Counterspelling is more powerful against illusion spells.