Both, as watch time contributes to your views more than anything if you're partnered. As for views, anyone can view your video for a second and it would count, IP Addresses are all different, but I would want people to watch the video entirely rather than just watching a split 2 seconds of the video and that would be all.
Making videos is to bring content that is enjoyable for YOUR viewers, if your just getting viewers watching 2 seconds or less of your video that is a bad outcome for the future of your channel. The time watched on your videos determines whether or not your channel is getting enough publicity as well as enjoyment from your viewers. The more Watch Time you have, the high possibility you'll get more views in the long run.