I have never used the Tejon, but I do have the Cortes and Im pretty sure there aint a coin or ring you couldnt find with either one. I happen to like the TID machines,granted they arent 100% fool proof with which they ID but the Cortes is PRETTY FREAKIN ACCURATE but you should always go by ear first anyways. The Cortes goes plenty deep even in Disc mode (at least in my soil) it locked on 2 merc dimes (same hole) and called it a quarter at 7-8 inches. I guess Im biased but if its coins and rings you want ,I"d go with a Cortes.HH
I have a Tejon and it does ok. with silver, but I would go with the Cortes as well. It is a nice frequency for silver and rings. I have a Silver Umax with the 10 freq. and it does great on coins and jewlery. The cortes would give a little more punch and options. I love the Tejon, but I mostly use it for relic hunting.