I run a Tejon as my main machine. I don't have any time behind a vaquero yet, so I cannot comment on its performance. I will tell you this about the Tejon, I have hunted parks, tot lots, ball fields, farmer fields, old houses, foundations...you name it, right here in PA soil, and I can tell you that it is very easy to work with.
Ground balancing is very quick once you do it a few times, and you can even tell when the ground mineralization changes as you are searching as it will start to give you a little chatter.....real simple....dial it back in and keep on hunting. I have not noticed any instability, unless I am around high power lines or other forms of strong EMI.
The Tejon will serve you well for jewelry as well. I have several silver rings and a silver bracelet, plus several necklace pendants to the credit of the Tejon. And for coin shooting...it will show you the goods, so be ready to dig. The most important thing with it is to set you discrimination to where you want it, and then dig everything. After a while you will start to hear the different beeps and blips and how it reacts to certain targets....once you learn it's language...it's game on...and that wont take you very long....couple weeks and you should have it down pat.
I like the Tejon for the dual discrimination, and the all metal trigger pinpoint....Tesoro hit it out of the park on this machine in my opinion.
Good luck with your choice, let us know what you decide and how it works out for you.
LittleJohn