Pre is standard I think, I had a trashy AAxx and couldn't get much stacks in preflop so decided to flat.

On the flop I have backdoor nfd and a gutter to the second nut.  Is this a standard x/c?  Or anyone donk or x/r?  I thought lots of turns/river can get tricky and we almost can't continue, whereas we can fold out his equity by x/r here.  At the same time, the hands that will fold to our x/r probably won't have much equity.. but we have poor visibility.

I'd greatly appreciate your thoughts!