It's been a while since I've seen both seasons, but I liked Gabon more and I'll explain why. Here's my scores.

Gabon - Winner: 3
Gabon - Entertainment: 10
Gabon - Cast: 9
Gabon - Gameplay: 8

South Pacific - Winner: 3
South Pacific - Entertainment: 5
South Pacific - Cast: 5
South Pacific - Gameplay: 4

I had a far more positive experience when watching Gabon than I had with South Pacific. I enjoyed both seasons, but I loved Gabon far more because it had better characters and better entertainment. It had a clear villain in Randy, good entertainment from tribal council. I never liked any of the final three that much in South Pacific and another thing that got on my nerves with this season was the bullying/group mentality on both tribes. Still think it wasn't that bad, I just don't remember any highlights and I watched this after Gabon.

I liked Sugar from the final three on Gabon, but not the other two.

Crystal shouting at tribal council lol.

He wasn't too bad, now that I think about it. Wasn't too fond of the cult thing, but I enjoyed Coach far more in Tocantins and Heroes v Villains. I'm gonna have to rewatch the season, I remember that his jury management skills were awful lol.