Which is more durable?

Is there anything else to consider when choosing between the two options?

I've used duracoat for years and it's always been tough enough for what I do.

I bought some air cure cerakote last week for the first time. Last evening I tried it out on an m14 handguard. Just got home this morning from getting coffee and tried to really dig in and scratch it with my fingernail and it wouldn't budge. 15 or so hours old and it feels great.  They say air cure is fully cured in 5 days.

I did it a bit thick on top and really thin on the backside just to see the difference. Both sides are tough. I could see myself using air cure cerakote a lot more. If I make myself a curing oven I'll give the heat cure a go too.

I want to do a whole stock and do a long term test.  

I use Duracoate.  Surface preparation is key to get a good durable finish.  I use scotchbrite pads to rough the metal up
If I had a bead/sand blaster I would use that.