The Smart Parts 360 QEV is the most likely to fail.
Its more likely to become blocked up and stop working.
It also has the lowest performance when it is working. (in terms of how much air it vents)
Virtues QEVs are just an off the shelf part by clippard.
Clippard are a real pneumatics company, so they know their stuff and are capable of designing far better valves than any paintball company.
They are cheaper because they are made in huge quantities, for various applications, not just for paintball.
They are much better quality.
If you could buy direct from clippard instead of going through virtue, it would be even cheaper.