Hi,
"Which xxx is better?" is a vague question.
It´s as vague as asking: "Which car is better?"
You need to find out on your won which items are important for you.
* is it "fast resonse time"
* is it high data voulme over ethernet
* is it more related to HDD access, with multiple small packets or a few big packets of data
* is it processing video streams
* is it lots of huge database access? On SRAM or HDD or SSD?
There are lot of jobs that (maybe) your server has to do. Nobody can tell where the bottleneck in your system lies. Processing power, ethernet, HDD or anything else.
There will be a lot of tools that can show you the load factor of the different parts/sections in your server.
Klaus