What equipment is best suited for the bitcoin mining? It all depends on your financial capabilities and plans, especially in the long term.
Almost everyone has universal chips (CPUs and video cards) and they can be safely used for the initial study of the cryptocurrency world. With the help of a regular computer you can start to work without any additional investment. Besides, this technique is always in demand and you can easily sell it if you decide that this kind of earnings is not for you. However, it is pointless to mine bitcoins and litecoins directly with any conventional computer now. Besides, the cost of received coins is quite large due to the low energy efficiency.
The specialized equipment based on the ASIC is very efficient in terms of electricity costs per unit of the mined currency. In addition, these devices are developed with consideration of the scalability. Their only disadvantage is the narrow specialization. So buying ASICs is justified for advanced users who plan to engage in the professional cryptocurrency mining on an industrial scale.