VirtualXposed = VirtualApp + epic , it make the target app(such as YouTube) run in VirtualApp(and VirtualApp runs in system) , then make hooks in VirtualApp and loads the Xposed modules.
EXposed/TaiChi = Modified apk + epic, it modified the target apk and install it in system directly.
The stability of VirtualXposed depends on VirtualApp and epic, while EXposed/TaiChi only depends on epic. EXposed modify the apk, which may cause signature error. But we have Xposed to bypass the detect.
In a word, EXposed/TaiChi is much more stable than VirtualXposed, and the performance and the fluency of App is better than VirtualXposed. Some app like VPN/InputMethod can not take effect in VirtualXposed but EXposed/Taichi can. While VirtualXposed can run multi-app like Parallel Space, but EXposed/TaiChi can not.