Black hot can have better resolution for ID and detail, but white hot is far faster to find things and easier to stay on movers. Humidity can often be mitigated with settings and such, but will also eat batteries due to constant nuking and gain adjustments.....whether manual or auto. Larger sensors usually handle bad conditions better......50-60mm, all else equal. 640 and 12um with good cores are where you can get extra detail and resolution at longer range and higher magnification.....but these are all generalities. Thick vegetation is a pain, but thermals are still better than any NV that has to have an illuminator, due to all the reflectance from the IR back at you.....creates white out and shadows......but they’re all useful over nothing, for sure. Once you start, you want better, and better. Once you’ve used good stuff, it’s hard to deal with lesser. However, you don’t need something high end for under 100 yards or 22 use, either.