Welcome Alan
Tesoro detectors no matter which one you choose will serve you well. None of the Tesoro line up would be out of your league. Once you decide to take the plunge
and purchase a detector some time should be spent reading and rereading the manual and learning the basic features you will use in the field. Make sure you use headphones
for two reasons. One is that you will hear subtle differences as you encounter different items in the ground even tho all but the Golden are single tone detectors and two, it will extend
the battery life of those in your detector. (Which is incredible to begin with)!!
You named a couple of detectors but didn't state what kind of detecting you would be doing. If you want to mainly coin shoot the Golden is a great choice but if you want to
hunt relics or go for deeper older coins there are other Tesoros that may suit what you want to do even better.
I cannot speak of the AT Pro as I have never used one but after reading other users comments it would seem to have a bit more of a learning
curve. But again that is a choice you will have to make.
Being a user of many makes and models of detectors over the years I can only state that the Tesoro brand has been the most fun and rewarding for me personally and
know that should I ever have a question or need help, Tesoro's phone line is always open (during business hours of course). Tesoro's lifetime warranty and customer
service cannot be beat by any other manufacturer. Understand that I'm not saying others are bad.
This forum is filled with devoted users with far more experience than I that are willing to answer pretty much all the questions you could ask.
Hope this helps, welcome again to the forum and hobby.
Happy Hunting

Gary