Preference and environment. I went from cages to clipless and have gone to pinned platforms and sticky shoes. (I chose 5.10s for shoes and really like them.) There are some situations where I end up going over the handlebars and need out of the pedals NOW. When I was clipless I ended up having the bike follow me tagged to one shoe. On a stiff climb I had to restart and ended up cratering.

The power transfer with good clipless setup is the best, but you are locked in. But platforms with a good sticky bike shoe is a very close second. PLUS, a sticky shoe lets you hike around without a metal cleat where you need traction.