July Lottery

I scored early access for the July 2025 lottery. I’ll pick my dates March 7th. I hear July is brutal with the heat though. What would be better, the end of July or beginning? Or is there even a difference?

Also camp ground wise, what would be best? Hike down South Kaibab stay 2 nights at Bright Angel, then hike back up South Kaibab. Or Hike down South Kaibab, stay at Bright Angel 1st night, stay at Havasupai 2nd night, Hike up Bright Angel trail. Any advice would be appreciated.