How do these systems compare to traditional cluster task schedulers like PBS and SGE? Is it that Mesos/Borg/etc have tasks that are managed within the program a

How do these systems compare to traditional cluster task schedulers like PBS and SGE? Is it that Mesos/Borg/etc have tasks that are managed within the program as opposed to the PBS/SGE model where you write separate programs that can then be scripted to be distributed? (Not counting MPI). Are these like the next generation of task schedulers, or are we talking about a higher abstraction level?