Unlike computer games in which the quality of a gameplay is defined by the combination of various technologies a major factor (along with clock frequency) that determines the performance for the producing cryptocurrency is the number of universal processors in the core of the GPU, and the architecture of connections between them.
In this respect, the integrated video processors that built into the core of the CPU or the motherboard are absolutely not fit for the producing coins. A hardware on the basis of chips nVidia also not well suited for work with algorithms of the digital money. These cards are good in games, but the specific of their internal architecture does not allow them to effectively mine altcoins.
Solutions on the basis of video chips from AMD are the only appropriate variant. All adaptors from this manufacturer, starting with the youngest models up to the latest R9 series in the lineup, are built on the large number of universal processors operating at low clock frequencies.
In addition, the internal architecture of connections allows performing calculations by cryptocurrency algorithms for 1-2 cycles, whereas for chips based on nVidia need 3-4 cycles to compute. As a result, the equipment-based on AMD chips is faster and consumes less power than competing products.
The choice of a specific manufacturer does not matter, but in the first place you should pay attention to the efficiency of the cooling system. The mining cryptocurrencies on graphic boards involves a multi-day round-the-clock work, and they should get well cooling.
For the same reason, you have not to use the laptop, even if it has a modern powerful video adapter. Notebook cooler absolutely not designed for continuous operation at a full load.