Maybe personal preference. That seems to be the case for most of these new aircraft coming to DCS these days.
Only saying old generation aircraft because that is what most of these aircraft are. The WWII-era planes, trainers from Czechoslovakian and Spain times, Korean War, and even Vietnam. Not only until now have we started to push out the modern aircraft like the Hornet, Gazelle, Mirage, Harrier, and (arguably) others like the Tomcat.
We still see a mix of these two, from modern to old like the I-16, and MiG-19. But there is definitely a notable shift from old times to wanting all the modern air combat. ]