It was easy for me, and my 'black' Vaquero is at-the-ready w/6" Concentric mounted for the bulk if my needs, and the 8X11 RSD DD is on a spare lower rod in my accessory coil tote should it be called into service.
The one feature I like best on the Tejón is the variable Tone control. That's it. I compared all three of the Tejón's I had against all of my other Tesoro models, and some competitor's devices, and did side-by-side evaluation using different search coils. In some tough ground mineral challenges most other Tesoro models in my arsenal would match or exceed the detection depth and ability of the Tejón unit using the same size and type search coil. I see absolutely no practical use for the dual Discrimination design. Oh, there is one other thing I did like about the Tejón, and that is the use of AA alkaline batteries. They cost less than 9V batteries, and all my non-Tesoro detectors rely on Double-A batteries.
The Vaquero's I had before worked fine but I was relying on my other manual GB Tesoro's to handle my needs. The problem was the low-tone audio. In late 2016 I got another Vaquero as I was thinning down some of my detectors, and January of last year I sent it off to Tesoro for the High-Tone modification. Now I am really enjoying my Vaquero as it is simple, uses an uncluttered control set, and has all the adjustment functions anyone might need. I compared it with my friend's Tejón and different search coils and we both agreed. The Vaquero had a bit of an 'edge' in responsiveness on a broad range of conductive smaller targets.
I am not saying the Tejón doesn't work, just that for me and the types of sites I prefer to hunt, the Vaquero works as well or better. Do some side-by-side testing with both, using the same coils and settings, and see what you think.
I made MY decision. YOUR decision might vary.
Monte