"Smartest Brain ... " no no no ... If I am smartest brain I am smart enough to know I am not smartest brain !!!
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I've been looking at DJI "pre-built" systems for a couple of years ...
Assuming funds are limited I would prioritize (in this order)
01 - Maximum time in air
02 - Spare batteries and other necessary spare parts, especially spare batteries
03 - Thermal capability
And yes, you want as much thermal capability you can get, but if you want AIRBORNE thermal, then you have to prioritize the AIRBORNE part. That is the point I am trying to make. So thermal capability is actually lower. Most hog hunters can ID a group of sounders by distribution and location without having to see the hairs on their snouts. A lone boar, by movement. Would a deer be standing their that long? Or a yote? Lone boars tougher, but not impossible with awful thermal. But the cost difference between an awful thermal and a good one is less than the cost difference between the longer loiter time DJIs and the shorter loiter time DJIs.
And disclaimer I am not a drone nerd (yet) ... BUT ... my only living BFF is a super drone nerd and he has been answering my question on this topic for the past 2 years ... and this is what is telling me ...
Loiter time is number one ... spare parts (especially batteries) is number two ... and thermal capability is number three.
And he comes out here and flies his drones and it is amazing ... with planning ... 90% of the flying is waypoint flying ... so the drone is flying itself. Of course the reason he does the racing drones is to train himself to fly the payload drones manually when required. So you spend 80% of your total flying time practicing to fly the payload drones 10% of the time
... at least that's how he does it. He's been flying drones about 5 years now,
And I would get DJI because every body else does ... my drone nerd buddy builds his own racing drones (3D print, etc.) but buys DJI drones for payload work.