One thing to keep in mind with the Tripltek...you are getting a full, unlocked phone. Great for SAR work. Don't need to figure out if you have wifi in the area, but then again you would be carrying a cell phone, so you could always tether the tablet to a wifi connection in the field. If I was doing SAR work with a drone, no matter how bright the screen was, I would probably be using a sun shade, or at a minimum, be wearing a large brimmed hat, so that hopefully I could shade the screen a bit. I would think that for SAR work, you would want a large screen so that hopefully you could make out all the details below. Best bet actually, would be to cast the screen to goggles, and you don't need the Tripltek tablet to do that. You could use a standard cell phone, but you would be limited to only using the goggles type of deal, but this option works, as long as the goggles have HDMI in. I have never done SAR work with a drone, BUT...if you were piloting the drone, viewing the Tripltek, and casting the screen to another worker viewing with goggles on, you would have two sets of eyes instead of one, and hopefully the Tripltek would be bright enough for the pilot to see almost the same amount of detail as the person wearing goggles. Keep in mind when watching comparison videos online...if the Tripltek has the anti-glare screen installed, the colors are a bit muted in vibrancy. Take off the anti-glare screen, and the colors are just as vibrant as any other screen without the anti-glare. To be honest, when I first got the Tripltek 7, it had the antiglare screen pre installed and I was underwhelmed with the quality of the video I got back. Took off the anti-glare screen and bam! Screen was great! The new 8" comes with an anti-glare screen, but they leave it up to you if you want to install it or not. For now, I have left mine off...and without it, there is plenty of glare in direct sun over your shoulder. I live in Hawaii...and in direct, over head sun? Hard to overcome that brightness without an anti-glare screen on.
I think for your particular use, you would have to try it out to see if it would work for you. Not sure if any of my info helps you, but hope so.