Whites MXT, M6, or AT Pro??? Which one to buy

[firefighter]

I think I have narrowed my search down to one of these 3. I really like the MXT or M6 mostly because they seem very well made and have the features I want, I seem to hear great things about those models and White's in general. The AT Pro seems like it would be awesome and even is waterproof......but I am concerned with the issues some have been having that I would be better off with a white's and a model that has been out longer. I am gonna use the detector for coin, jewelry, relic on land. Only water I will be near is occasional freshwater beach and very rarely like once a year when I go to the beach will it be around salt water. I would like to be able to search wet sand but I don't need to be in the water. I just want a great, reliable, proven detector that I will be able to grow into and not regret or have problems with and also not grow out of in a year or two. Please help. I have another post that is similar to this but now I have it narrowed down to most likely one of these detectors.

Thank you, Chris