The 9.3 is a mild recoiling round that performs very well on game, including Eland. It is not thought of as a charge stopper and while it is capable of killing Big Five animals, I do not recommend it as a Big Five round. It is a bushveldt cartridge, meant for shots <200 yards.
The .375 is a bit more powerful than the 9.3, recoils more and shoots flatter. It is more versatile because of it's flatter trajectory.
If you are going to be hunting PG in bushveldt conditions, I would recommend the 9.3. If you will be hunting PG in open country, the .375 will serve you better.
Actually, for PG in open country, I would recommend the .338 Winchester. It shoots flatter than either the 9.3 or .375 and is capable of clean kills on any PG animal out to about 300 yards. I killed a large Eland this past October at 312 yards with my .338.
