Can you explain how having a 500 g/hash compared to 200 g/hash will be more profitable to the miners? Because I am considering this and not seeing it.
It won't be more profitable. It all has to do with probabilities. Over time, everything will average out.
500 g/hash is somewhat more likely to make payouts more consistently over short durations. Each block requires a random amount of time to solve. So at 200 g/hash, you might solve one block in 40 minutes, or it might take you 2 hours. That means in one day you could have as many as many as 36 solved blocks, or as few as 12.
When your doing 500g/hash, you'll be solving blocks quicker, which means probabilistically, you should approach the average quicker.
In either case either pool could win or lose the random lotto, and vastly out or underperform the average for any span of time, it's just increasingly unlikely the faster you go, and the longer you're at it. (hence why pooling is more consistant than solo mining).
Testing out one pool for a couple of days, and switching won't tell you anything, because you might randomly outperform or underperform the average on those time scales, regardless of the pool.