[QGIS-Developer] The correct import Qt5 in plugins

[Xavier Corredor Llano]

Hi all!

I have a question, I'm developing some Qgis3 plugins, I see that Qgis has some 
"links" to the Qt library, like as:

from qgis.PyQt import uic
from qgis.PyQt import QtWidgets

But, normally it is:

from PyQt5 import uic
from PyQt5 import QtWidgets

Both works well, but:
What is the difference and what is the recommended one?

Thanks
Best regards,
Xavier Corredor Ll.