I have installed NVidia graphics card on my notebook, which supports Optimus technology (second graphics card is integrated on the Intel processor).
Suppose, I am with my notebook on AC adapter forever (or at least 99% of my work with notebook) - is there any advantage of preferring optimus option over discrete graphics card?
Yes, you will consume less electricity and thus pay less on your provider :)
On some laptops, it also enable the CPU to run at full speed, while it's not the case when the discrete GPU is activated (due to global thermal profile).