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Why custom computers are better
Definition
Custom computers, for the purposes of this article, include those built by the local PC builder and seller and/or by users themselves, that are built to a standard ATX layout (http://en.wikipedia.org/wiki/ Atx). "Custom" can be a misleading term, but what it means here is that the computer is a configuration of individual components, as opposed to a single unit "model" from a major manufacturer.

Options
When it comes to choosing a computer, the options are plentiful. There are significant advantages to a custom computer including upgradeability and reparability. The types of PC's to avoid, except in particular circumstances, are those with a proprietary design: particularly of the slim, micro, or mini variety. Laptops are a direct example of proprietary design and serve a very particular purpose and market segment. Within desktop models, rarely does the 3-10" difference between micro, mini or standard sizes make much of an advantage either way considering desktops are usually tucked away.
Preconfigured computers
Bloatware and Images
Preconfigured computers from major manufacturers can be a great option for many users. They tend to have the best warranties (although local PC builders may be very competitive) and they are often priced attractively. They will be preconfigured with an operating system image and may also be loaded with "bloatware" (software you don't need or won't use that will slow your system). Often the software that comes preinstalled will be difficult or impossible to uninstall. Preconfigured computers most often come with restore cd's that are the final troubleshooting step of the vendor. These restore the computer to the bloated state they were in when the user first got them and sometimes won't even solve what could be a deeper issue.
Ram and Drivers
Another thing to consider is that preconfigured computers will often come with a minimum amount of ram relative to what is needed to run smoothly and fast. One other consideration with preconfigured computers is that the user relies on the manufacturer of the system for driver updates, both when an issue is encountered and when an upgrade is available. This generally adds additional time before the latest drivers become available.
Reparability
The problem with a preconfigured (and especially proprietary design) is that as soon as non-standard (proprietary) parts are used, the cost and or ability to replace them becomes very expensive

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