Those are big companies, and they have invested lots into global services and people. It has to play a part in saying "which is the best SCADA", right?
Or does the licensing, pricing, ease of use and training outweigh all of that?
But what fraction of those resources are devoted to SCADA, 1/10? It is skewed due to the hardware/distribution services of these companies.
A software product like SCADA is different. Distribution is done over the internet, support is done over the internet. Completely negates the need for local resources. Need SCADA support from Rockwell, Siemens, Schneider, Wonderware? Well a local tech isn't coming out, you're calling a phone bank to some central office. In the case of SCADA, they will open a Webx or gotomeeting to get eyes on the problem and help you out in real time. Exception, if you're a BIG manufacturer that spends $$$$ then you'll have a corporate specialist on the first flight to/from anywhere.
If your company doesn't have the resources to be somewhat self-reliant, then you are correct the decision is more about finding the best local integrator you can and accept that you are a sheep to them, and the big boy they are in bed with. Regardless of the platform, if your local integrator provided it, they are pretty much your only option especially if it's complex. Doesn't matter if it's Wondeware, Rockwell, Schneider, Ignition.
The other side of the coin, big business means bureaucracy, slow updates, slow change and you may or may not get the best tech support anyway. Ignition being a smaller company is actually a nice change. I've been to their offices on a number of occasions, met the developers and staff. I've made suggestions to improve the software which have been considered and some implemented. Typically if there are bugs in the software they can address them and put out updates much much quicker than the big boys. Not to mention the framework it is built upon, Java. It can run on just about anything, the risk of performing windows updates is minimal as it won't impact Ignition (unless it wrecks java), Ignition updates are simple.
Imagine this scenario "Corp IT has mandated that all servers need to be updated to Windows 2012 R2, this includes all automation resources. "
Who panics because they are using Wonderware System Platform?
Who panics because they are using FactoryTalk View?
Who panics because they are using Ignition?