TejanoTrackie 

The real answer is that any one setup doesn't work for all situations, which is why I have more than one bike. I have clipless on some bikes, both SPD with walkable shoes and road clipless, old school clips and straps with old school slotted cleats on the shoes, plain pedals with no retention and of course one bike with the Retrogression setup. Which bike I choose depends on the type of riding I am doing and the clothing I am wearing. All of my FG bikes have some sort of foot retention, mostly clipless, which works best. My latest hot setup is SPD clipless pedals with SPD walkable sandals; you can laugh all you want but it works very well.