both. just depends on mood and purpose of ride. most of the time, i ride clips and straps because of the reasons stated above (i can wear any pair of shoes i want, great for errands, etc.). but when i go on longer rides, just to ride, then i will swap them out for clipless. clipless feels safer -- much easier to get your feet out of, if you are one of the people who pull the clips and straps tight, like me -- and they have much better power transfer. plus, on longer rides, my feet go numb with clips and straps, whereas on clipless they feel great. but yeah, for commuting, short rides, pub 'n pedals, then i like clips and straps.
also, someone above said clipless are scary if you ride brakeless. for me, it's the opposite. i've never accidentally clipped out of my Candy SL clipless pedals, but i've had a scary moment or two trying to skid with clips and straps and have my straps come loose (but i'm a big guy...)