RAM: DO gives 2x as much RAM at each price point
CPU: Unclear. Linode gives you 8 cores across the board, but fewer "priority" ones. Probably needs benchmarking to be a sensible comparison.
Disk: Linode gives between 1.2x and 2.4x as much storage at each price point
Transfer: DO gives more transfer at the low end, but Linode ramps it up faster. DO gives more transfer at $20, they tie at $40, and Linode gives more at $80+.
I agree with the author that Digital Ocean is generally cheaper for my use-cases as well, but there are some where it isn't. For example, if you want 8GB RAM + 16TB transfer (to pick a configuration favorable to Linode), that's $160/mo at Linode but $300/mo at DO. On the other hand, if you need more transfer only occasionally, DO can be cheaper because it somewhat makes up for less included bandwidth with much cheaper overage rates ($20/TB vs. $100/TB at Linode).