I use Shimano M520s on all of my bikes, road or mountain. The M520 is cheap- $50 - rugged and, most importantly, double sided. I've ridden for many, many years with toe clips and Look cleated pedals (the big plastic ones) and spent way too much time trying to flip the stupid pedals. A double sided mountain bike pedal is perfect for getting clipped in quickly with a minimum of fuss.

Personally, I can't see any cons for riding with clipless pedals while commuting. I've never had a problem unclipping - not with SPD, anyway - but I have really good low speed skills (I can trackstand pretty confidently). I can also unclip quickly from years of mountain biking on them. Falling off a mountain because you can't unclip your shoes is a great educator

I do see some cons for riding with toe clips or with platforms. My biggest problem with toe clips I've already made clear. Toe clips are also harder to use with shoe covers and I found them to make my feet colder because of decreased circulation. Platforms bug me because I can't pull up on the pedal, something that I've done for so long that it's second nature. You might as well ask me to write lefthanded Also, for rough terrain, platforms don't keep your feet connected, so there's more likelihood of slipping off the pedal and gouging bits of your leg off. Even in the roughest of conditions, I'd rather be attached so that I can easily lift the rear wheel or spring it to one side, etc.

YMMV