It’s likely that it’s mainly used for ground travel as opposed to space, so perhaps Han doesn’t have access to a better ship at this point in time.
In the photo, one can see an extremely wavy haired Han Solo (either actor Alden Ehrenreich or a stand-in) sitting in a pretty beat up cruiser of some sort.
Asides from proving that Han Solo likes to drive around in fixer-uppers, this could be how he got around before he owned the Millennium Falcon.
Either way, it has a very old school sci-fi feel to the design, as it rightly should.