Vertical scaling is adding more power to the machine that runs our website or application. It is often the easiest option as code only written to run on a single machine - which is usually most code - can be moved easily to a bigger machine, especially if you already have automated server setup with Chef.
At enterprise level you should probably have a server on standby for redundancy in case of hardware or software failure anyway so you may as well use it to handle traffic.
Horizontal scaling is adding more servers and sharing the load between them. It can also have the advantage of adding redundancy. If we have two web servers handling traffic and one breaks our websites will remain online. If we can separate various parts of our website or application into different services we can have even more redundancy.
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