The pedal which is easiest to get in an out of will be the pedal you use the most. ALL clipless systems take some adjustment and practice on the part of the novice clipless user.
If you are riding on the road, just get normal road pedals like Shimano SPD-SL or Look Keos. If all you intend to do in sneakers is ride to the cafe or shops, then you can easily do that with these (I do for rides up to 15 minutes).
If you are mainly mountain biking or just commuting then MTB pedals are more the go. Most MTB pedals are double-sided for use with cleated shoes. This does NOT necessarily make them useless for a quick spin to the corner shop in your sneakers. Single-sided MTB binding pedals are available (like the Shimano PD-A530), and they do make use with sneakers easier, but the ease of use of these with cleated shoes is compromised by the fact they are not double-sided. I have never really understood the need for this type of pedal since (1) they are more difficult to use with MTB shoes than double-sided entry types, and (2) you can walk around in MTB shoes anyway, so you don't really need the sneakers.