I had to make the same disision , but the outlaws no motion all metal , and threshold all metal made the disision for the outlaw, I figured it would have no depth , but i was wrong it did better than i figured , actualy deeper than my other tesoro machines like the cibola , silver umax, golden, and compadre, i have never tried the Vaq but becuase it has a bit higher khz it may not be deeper on silver coins, I would like to do a comparison , but since you have a umax already you can use the coils interchangably and this is a plus. what i would do maybe is find somone who owns a vaqeuro and an outlaw and do the depth testing then you will know for shure, I have a friend who may be able to let me use his vaq for some depth testing in the future. hope you make a good disision, I know they both are good detectors,