Bias Amp (and Bias FX) sound great. The best tube simulation. But they are not the most stable software. They fix and break something with each release. I’m already tired of that instability.
Guitar Rig 5 is still one of the best (but not the most modern).
Amplitube 4 is great sounding too but eats a lot of CPU.
So, I mostly use Guitar Rig 5.
About 90% of these tracks have it as a guitar vst (and 10% Bias Amp):