$ otool -L bin/pythonpython:@executable_path/../Python (compatibility version 3.4.0, current version 3.4.0)/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1238.0.0)
pyenv local 3.9.0 # to prevent 'interpreter not found' in mkvirtualenvpython -m pip install --upgrade pip setuptools wheelmkvirtualenv <venvname> -p python3.9 -a <workingdir>
is slower (by not having the app-data seed method),
is not as extendable,
cannot create virtual environments for arbitrarily installed python versions (and automatically discover these),
is not upgrade-able via pip,
does not have as rich programmatic API (describe virtual environments without creating them).