In your opinion, T13 Hardest role

Melee: DPS
Ranged: DPS + songs if Brd
Sch: Healing+dps
Whm: Healing
OT: Tanking+dps
MT: Tanking

What job would you consider the most difficult to do properly in T13, curious on opinions.

Depends on too many factors.
If your talking beating it during progression with bare minimum gear and hp to survive mechanics with succor/soils down its going to be the SCH.
If your talking about now and being far over-geared (just by poetics and weeklys) and everyone having enough hp to survive mechanics without even needing succor/soil/dragon kick, I could see a for a sub par whm managing mana being the hardest part. Every mechanic in the fight is pretty much just about the entire groups execution and not intrinsically hard to learn or do, its just a long fight with a lot of opportunities for failures that add up over time.

Probs healers. Or tanks. Definitely not dps.

Dpsing sch I guess? depending on how much dps he wants to achieve. Maybe tanks that stance dance as much as possible w/o causing wipes?

As above said, too much gear now just makes dps roles a joke.

Probably healers.. dps scholar?

I think the difficulty is in finding the right balance between DPS and heals.
too much dps and the whm has to cover up the slack.

Healers have the biggest learning curve for t13 and they need to be ready to heal any mechanic derps.

The hardest job is the OT IMO. Picking up the adds before they wreck the healers takes practice and precision. Mainly due to the horrible aggro system.

The OT also needs to have good Orb awareness during phase 2.

Final phase the tanks have the tethers to grab while avoiding megaflare clips and earthshakers pulses.

I'd say WHM. DPS SCH all depends on the WHMs competency, and the further you progress the more the healing burden is squared on the WHM to close to solo heal the fights just so the SCH can ride Clerics more.