For the skill mods/combat effects information (an old link but the general info is still relevant): http://everquest.fanra.info/wiki/Skill_Modifiers_and_Combat_Effects
The general consensus is that tanks (War/SK/Pal) almost always choose AC augs over HP augs - with heroic stats/mods such as heroic: agility, dexterity and stamina preferred at lvl 90+ and corruption resists where possible from 95 +. This, as HP tends to take care of itself on gear at the higher levels.
One way I justify AC over HP for augs when tanking is that:
Every hit that you take in a fight, is mitigated by the higher AC value gained from the item on the character. As opposed to A 100 HP aug, in which the additional (HPs) would only come into play (and make a difference) when you about to die. In other words those 100 HPs on the aug did nothing for mitigation, throughout the fight until the tank is a 100 Hps from death..
The SK class sites AC-Aug list (updated post HOT expansion, by contributors-lower down in the thread): http://www.evilgamer.net/forums/showthread.php?t=4870
Can't remember the specifics re weapon damage/delay ratio, but at higher levels many of the best SK and Paladin class specific 1 handers have higher damage but with a higher delay than a Warrior specific or multi class 1h weapon.
Good luck.
Edited, May 25th 2015 5:57pm by hexeez