I have the Tejon and have not experience the interference mentioned - yet. It is a good bit nosier than my Cibola, and thats expected, but at the moment I wont let either machine go. For grab and go short hunts I'll use the Cibola, otherwise it's the Tejon. This is in regards to my Tesoro's as I have other machines too. For relic the Tejon is my first choice. For a little park coin hunt, the Cibola is my first choice. Other than the stock coils, the 5.75 concentric and 5.75 widescan work for both machines.
I think the Vaquero would be a good compromise between the Tejon and Cibola. I have heard all good about the Vaquero too.
I have a somewhat desire for the Cortes because of the additional info but the small display may not agree with my eyeballs. This is not to say anything wrong with my Tejon and/or Cibola, it's just that I like Tesoro machines.
Tejon: Deep, two discriminate's, manual ground balance for conditions, tone adjustment for the hearing, threshold knob.
Cibola: Supertune for extra depth when needed, sharp discriminate (like the Tejon), preset ground balance, frequency shift.
They both work for me and have served well.