pytest assert vs self.assertEqual

example.py

class TestSomething(TestCase):
    def test_something(self):
        assert something['message'] == 'Asserting that a very long message statement is as expected in this test case here, the issue is that its all on one line with no easy way to conform to PEP-8 besides adding "\" to continue the one line statement in python.'
        self.assertEqual(
          something['message'],
          ('Asserting that a very long message statement is as expected'
           ' in this test case here, the issue is that its all on one line'
           ' with no easy way to conform to PEP-8 besides adding "\" to'
           ' continue the one line statement in python.'
           ' With assertEqual and the function structure we can easily'
           ' break up a long assert statement to make it readable and'
           ' PEP-8 compliant.')
        )

would you recommend to always use pytest assert ?