The one drawback to flats is that even with the best pins and super grippy shoes is that at some point along some trail your feet will come off the pedal and you will take a pedal full of pins to your shin. And it will swell up, bleed and bruise and it hurts.
I switched to clipping in and haven't taken a pedal to the shin yet since I did. Wanting to bail quick was a feature I wanted clipping in so I went with Time Atac Pedals and the 10 degree easy release cleat. To my knowledge, these are the easiest pedals to unclip from.
https://time-sport.us/collections/mountain-bike-pedals