I've always felt like the aoe heals were more than six times the aggro of a normal heal, but that's just anecdotal. You can test the exact aggro of the two spells by just asking a GM to look at combat logs for two different fights where you use the spells (so one fight use an aoe heal, another fight use the corresponding single target heal, and ask the GM to compare the aggro values).
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Project 1999 (PvE):
Giegue Nessithurtsithurts, 60 Bard <Divinity>
Starman Deluxe, 24 Enchanter
Lardna Minch, 18 Warrior
Project 1999 (PvP):
[50 (sometimes 49) Bard] Wolfram Alpha (Half Elf) ZONE: oasis |