I can only cite from personal experience, but I have no issues of stability with VST3...I use VST3 as my first choice and resort to VST2 only when a 3 is not available...
I have seen some CPU usage drops when comparing VST2 to VST3 but it's not a substantial savings, more like a few percentage points...I'm running an 8 core/16 thread AMD Ryzen 2-2700, so CPU use really isn't a concern for me...
As always, your mileage may vary...
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