Brand: choose a reliable business, because this is very much to do this industry, there are a lot of small workshops casually buy a second-hand motherboard assembly is also pretending to be an industrial control machine, the price is also particularly cheap. When choosing must pay more attention to the selection, try to choose some of the larger brands.
Service: industrial control machine general life of 5 to 8 years, the middle of the difficult to ensure that there is no problem, the key is out of the problem how to solve. So when you choose on the one hand, choose a longer warranty period, so that the after-sales cost is lower, and since the warranty cycle dare than others to commit to a long time, the quality should also be more reliable. There is also to look at their outlets, pay special attention to these outlets are agents or directly operated, agents, then it is difficult to get involved. There is also the service concept of this company (this is not good to judge)
Price: do not choose too low, the quality is not reliable, but also do not have to be too expensive, not cost-effective. Pick a reasonable price (according to your configuration for reference)
The rest can meet your parameter needs on it.
Finally recommended a few self-professed reliable, Advantech, Apache, research Yang, etc.
Hope to be useful to the owner, also hope to adopt