Unless you're mountain biking on rough single track, or racing, clipless isn't worth it, IMO. When I used clipless, I noticed almost no performance advantage at all, and I also found them to be annoying, because you have to wear special shoes to use them, but also because of the constant clipping and unclipping at intersections. On my commute, whether I use clipless or platforms, it takes me exactly the same amount of time to get to my destination, and my speeds are the same. Okay, on big hills, with clipless, my speed is about 0.2-0.3 mph faster; that's it. For me, the ability to get up a hill 4 seconds faster while I'm commuting isn't worth the the disadvantages of clipless.

The only real advantage of clipless is that they keep your feet on the pedals without slipping. Platform pedals with pins accomplish the same thing, but they're not a PITA in heavy stop & go traffic, and you get to wear whatever shoes you want.

That said, if you're committed to clipless, get MTB pedals and shoes. They're far better suited to commuting than roadie pedals & shoes.