There is a good reason to use AES-256 instead of AES-128, whenever practical: you will never have to have an option for configuring this.
I believe most AWS outside of TLS load balancing unconditionally uses AES-256.
Does any vendor charge extra for AES-256 over AES-128 for terminating TLS? It would be interesting to see how much (little), if any, measurable performance difference there is, for commercial CDNs/load balancers.
It’d be good to see the mobile phone battery hit measurements.

