3 slotted tough would be my choice
I'm not a huge fan of health myself, and I think the slots would be better spent in tough. Although I actually have neither.
The slots in Tough would be better spent.
BTW that second slot in Resilience gives you like 1% extra res to S/L.
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The benefit of Health over Tough is that it's always-on, costs nothing, and is effective against all types of damage as opposed to just Smashing/Lethal - but it won't take the edge off alpha strikes. If you've already made the sacrifices to get Tough, then yes, you should slot it as a priority.
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Personally I'd go for Health - and I did. Too much of the damage in the game is non-S/L to rely on Tough, IMO, and Health synergises very well with the rest of Regen. Sure, it doesn't help against an alpha, but neither does Tough if the alpha is Fire, Energy, Psi etc. Dull Pain will help there, though, and Health will make all those extra HP work for you in getting you back up to strength again post-alpha.
The only exception - to my mind - would be if you plan to PvP a lot. Lots of S/L there, and things move a bit too quickly for Health to do you as much good.
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I'd got for health, I dont have tough in my regen's build. That said at 35 I've not found the slots for health yet either
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Go for both! 3-slotted Tough first though.
To stuff a figure on this: 3-slotted Tough plus Resilience will give you about a 25% resistance to Smashing and Lethal damage.
Putting real figures on how Health affects you is difficult because it interacts weirdly with the other regen powers.
I'd suggest playing with a toon builder program and seeing what you can get out.
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Go for both! 3-slotted Tough first though.
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I second this 
Me 3 i have both tough and health. and as someone said earlier sloting resilience is pretty pointless. even 3 slotted the damage res is next to nothing.
As a regen which will yield more protection, 3 slotted Health, or 3 Slotted Tough? (baring in mind I have 2 slotted resiliance)
Wondering which pool to get and haven't got enough spare power slots to choose both at the moment.