Sim Earth is by far the deepest of the three and probably offers the greatest potential for enjoyability if you actually get into it. The problem is that almost no one gets into it because it's so slow and, for most people, uninteresting.
Ballistix has an interesting and unique premise, but the gameplay just feels too random and crazy to provide enjoyment for more than a few moments. You might be able to squeeze some fun out of two-player mode.
Power Golf is a lousy game. If you've never played a high-quality old-school golf sim, you may be more forgiving of its crappiness than I am.
All three games are poor, but I'd choose Ballistix, as it's the least of the three evils.