The good thing is you guys don't have to understand.
We can only go by what you post. If you say Street Fighter PCBs then that tells us that the cab you can maybe not quite afford isn't actually the best option for you, that's all. Those older PCB games will look bad on it, and be harder to get working. That's not me pushing an opinion, it's just the fact of the matter.
You didn't mention that SFIV was your priority. In that case of course you want a Vewlix style cab. If you're going to put say a PS4 in there then honestly your needs are much more modest. But if you want to switch back and forth from a PS4 to jamma PCBs it will add some complication. Maybe you don't care about that, or even want to hear the opinion, you're kinda prickly, but people are just trying to steer you to something that will work for you, we all just want people to be happy and able to play games here.