I use htop. I tried glances as I heard good things about it. It is nice, I like how it has more stuff -- disk, network. However it installed matplotlib, fonts-lyx, tk8.6, libjs-jquery-ui, python3-bottle, and a slew of other dependencies, not a big deal but something to watch for.
apt-get. It was painless, and I have the diskspace so not a big deal. Looking at package properties I see it recommends a bunch of packages, so it installed those and their deps (this is Ubuntu 15.10):