I believe an incubator is more reliable as long as you have a good incubator set-up with a GOOD reliable proportional thermostat, but another advantage of using an incubator is that you can get your female eating about 2 months sooner thereby getting a better start for the next breeding season. This can be especially important for late clutches if you want to try and get mom ready to go for the next year. As for temps, I think 89.5 degrees is optimal, but anything between 88-90 and you should be fine. Warmer temps and your eggs will hatch sooner, cooler temps and they may take a couple days longer. A word of caution. Eggs handle lower temps/spikes better and longer than higher temps/spikes.
Good luck

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