Bins vs pile

My boss has asked me to create a system for composting his yard waste. He has a large lawn, part of which he allows to turn into a sort of controlled meadow with only occasional, partial mowing. He also has plantings of flowers and ornamental bushes, fruit trees, and small vegetable gardens. Also dogwood, maple, elm, oak and other trees.

I've done some research, and I think I'm getting an understanding of the basics. But I'm not sure whether it would be better to build a system of wooden bins to move the piles through, or just use piles on the ground.

Can someone explain the pros and cons of these different methods?

A key factor is we want the piles to get hot enough to destroy the weed and grass seeds.

Thanks.