Differences between using KVM and virt-install?

[James Allsopp <jamesaallsopp@googlemail.com>]

Hi,
I was trying for ages to build a KVM virtual machine using virt-install 
and it always failed, tried KVM command directly following Gentoo 
instruction and got it to work first time. Is there any difference in 
the end result between these two methods?

Thanks,
James