One of the differences is that TPTP is “archived”.
From http://www.eclipse.org/tptp/home/project_info/devplans/EclipseTPTPProjectPlan2010.htm :
After many successful releases of TPTP, the project has evolved and matured. However, participation in the project declined over time. TPTP is in maintenance mode since TPTP 4.5.0 and at this stage the project cycle, PMK decided that TPTP 4.7 will be the last major TPTP release (part of Eclipse Helio).