ETH is good as both.
Long and short term.
ETH is good for long term.
You determine how long you want to hold it. I've sold some and still hold some because I've decided that there's a long term goal for etherem.
I'm good holding it and won't be selling it even if I've got enough profits for it already but I know that there's more after 2.0. I want to maximize my profit on it and possibly earn on it passively.
I've also sold some but I want to hold the remaining ETH that I have. I have been in good terms with holding Eth and very much well profited from it. That's why if I'm going to hold it, I'll definitely going to hold it and as much as possible will still add if I can.