Err, I still don't see why you wouldn't use both. You are not necessarily going to get healed back to full between hatefuls so why take the chance? By your logic, having anything over 8k or whatever health (not sure what the maximum hs is exactly for 14k armour but I'm pretty sure its less than 8k) is pointless because anything above that wouldn't let you survive a 2nd hs.
is it possible that some guilds have it on farm that they are looking to cut costs. If so, then dropping titans would be cheaper (i think) then dropping 4 stoneshields per tank (2min each, 7min fight, so 4 i figure per fight). Perhaps this is the motivation...?
Then why need a calulator at all? You are hardly going to get rid of 10g worth of consumables (depending on eel prices) but still use the 60g pot just because the titans are more effective. If you are trying to save costs, you ditch the 60g pot instead of the 3g one no matter which is better.
Anyway, the calculator shows the opposite according to the criteria he was judging it on (the ability to live through 1 hateful strike). Going from 12k armour to 14k only gives a decrease of 868 damage so having the 1200 extra hp from the titans would be more beneficial in surviving a hs. Even going from 10k to 12k armour saves you less than 1200 hp.
If you are talking about saving healer mana, then obviously stoneshields are way better. But I didn't need to a calculator to tell me that a pot that increases mitigation will save healer mana while a pot that increases hp won't.
edit: A useful addition to the site that was just linked would be to be able to check for mark/elixir of defence/(imp)devo etc. Just having stoneshields clickable while having to add up the effects of all other buffs is a little pointless :P. Otherwise a useful little tool.
Your extra life with titans may safe you once, but does it save you twice?
The amount that need to be healed every Hateful is the same with or without titan.
There is no need to argue anything. You're right, if you insist on using only one of the two, use stoneshield pots. But hell I don't know about your guildbank, but I wouldn't risk any more wipes than I'd have to just to save what? 200 gold?
Oh and you should probably stop signing your posts.