Has someone submitted Tankadin data wrt AD to beta??

Yup, and told you it was back of the napkin, 4% is potentially better in a few very specific circumstances, other than that its basically as lore said (and for a 24k health tank the break point is likely 12k, and 8k hits).

Basically there is little difference, but AD has the potential to do nothing, and the range can make it never trigger on certain bosses (Teron for example has hits which will bypass it typically).

AD ~4% mitigation.
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Armoury Link

Actually the chance of Brut 5-shotting you on a roflstomp is about 10-15% depending on how stacked your avoidance is. That's why you use trinkets and cooldowns

I don't have anything further to add on the topic of AD right now, but I would like to reiterate that the next guy I see who says "lol if my health goes below 35% my healers are sux" is getting a swift kick in the nuts.
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Gladiator Psiven, 80 Tankadin
Rival Psivenia, 70 Warriorlol
Psivenne, 60 Bare
Longtime addict of Space - Glory Through Conquest