The ATX form-factor was originally designed to cut the cost of producing a system. However it has several benefits that the end-user might not notice. The whole design allows for better airflow around the main system components. In addition, the fan located in the power supply is directed so that it blows directly over the CPU. The increased airflow over the CPU and whole system in general helps keep the system cooler, preventing from overheating problems and may even give a slight performance increase.
In the ATX form-factor, the onboard IO is placed closer to the devices it connects to. (i.e. The IDE hard drive port is close to the hard drive.) This reduces the required length of cables within the computer, lowering the margin of error when systems are being built. Furthermore, the external IO (serial ports, parallel ports, etc.) is built on to the motherboard. Being built directly on to the motherboard removes previously required connecting cables. Without the previously needed cables to connect the IO, the system reliability is increased because it removes the possibility of cables being jarred loose.
Easy access is the ATX form-factor's main benefit to end-users. The location of the CPU is far away from the expansion slots, allowing for full-size expansion cards in every slot. The expansion slots also are easily accessible for upgrades. In addition to the accessibility of the expansion slots, the memory sockets are easy to get to. They are far enough away from the expansion slots so that the expansion cards don't get in the way. Also, the reduced amount of cables within the case help the access to the memory sockets.
So, if it's the easier access to system components or possible performance increase that impresses you, ATX is the way to go. Even if you don't think ATX will benefit you in any way since you never have or plan to open your computer case, it still might be a good idea. Because, there may come a time when unfortunately something does go wrong with your system and you'll end up thanking yourself. (If not yourself, your computer technician will.)
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