Cloudflare. Cheap, fast and powerful. They seem to be doing everything right, as evidenced by all the growth and great features in a single package. It's rather surprising the other vendors aren't doing anything to even catch up.

If you need more control, than Fastly is very technical, although the recently launched Cloudflare workers give you much more programmability by running javascript.

For more traditional options, look at the quiet upstart Stackpath which is built upon the old MaxCDN network, and also CDN77 which is great value.