They are Block, Modified Block, and Semi - Block Styles. Hope this Helps:)))
It doesn't say what Technician B thinks, but I can tell you what the camshaft does and then you can decide who is right on your own. The camshaft is little metal rounded triangles above the piston that times when the intake and exhaust valve open and close.
Technician A is very wrong, the camshaft doesn't do that.
Answer: Alienware is really good if you are into fps games such as call of duty but it depends on your price I know alien ware can be pretty expensive so it's up to you.