Fyi there's a lot of debate over whether clipless is actually more efficient or not. A number of experiments or studies have suggested they're not more efficient at all, like this is the first one that popped up in a quick search:
https://www.youtube.com/watch?v=CNedIJBZpgM

I don't want to get into the endless debates - other claim clipless is less tiring, or that you don't regularly pull up but you do on sprints and hills. I dunno. But you should be aware that clipless are not automatically more efficient.

When I was using clipless Time Atac's were my favorite - as durable and shimano spd's, better than spd's in snow, you could tell when you clipped in or out (unlike crank brothers). If you aren't planning on winter biking in snow, shimano spd's were otherwise good.