I am sticking with Digital Ocean over Lightsail because I don't like potential financial liability. I like being able to not think about my vps for months and knowing there is a maximum amount I will be charged.
Personally, I would include support quality in this analysis, because you can always find cheaper VPS hosts.<p>One thing I also notice with DigitalOcean (may apply to the others) is that they proxy apt-get requests and cache them in their datacenter, so the network feels much faster than some cheaper hosts.