It's a few steps up from anything Conor has fazed yet that's for sure. I saw Conors UFC debut in stockholm and the way he picked Brimage (Who is no scrub) apart made me raise both eyebrows. His best win in my opinion was the way he handled Holloway even though he blew his knee. That showed grit and heart needed to be a champ.
Aldo is a different beast. His kicking-game will not allow Conor to stand the way he does for long, but kicks also lend themselves to counters which Conor does well. Both also hit hard but Conor seams to have mote accuracy. So, for me it's kicks vs accuracy that will be the main point.
For me it's very 50-50 but the mentality gives the edge to the Irishman, he clearly is in Aldos head. But on the other hand, long term champs are just that, for a reason.