The Conquistador isn't really known for its depth so would not recommend for relic hunting. (more of a Tot Lot killer) Neither is the Simplex really (Although a good machine for a variety of conditions it is lacking in the depth department per my own test garden tests and use)
For those deep 3 ringer bullets I would go Vaquero if I had to chose between the 3 machines. I had a Vaquero that I used in the fields and it hit deep in mild/moderate soil ( I certainly wouldn't buy a Vaquero new though as they are Out of Business but if you can find one in the 250-300 range then that would be fair.)
I'm curious are you asking because your on a $300 dollar budget?
I would add in terms of depth on relics in the field I haven't had too many machines that rival the Vaquero the Deus is very close and the Equinox is on par if not better with stock coil.
I'm not a Teroso historian but if I recall the Bandido II circa 2000/2001 was replaced by just the "uMax" which was the model directly below the Vaquero in price roughly $250 new. Yes it is a good machine - I don't believe people got the same depth from the Umax as they did with the Vaquero though. (The Bandido is before my time)
Have you considered the Minelab Vanquish 440 - much more modern machine and will get you the goods. $279 from Bart @ bigboyhobbies hard to beat.
Also at $279 leaves you with a little bit of budget towards a decent pinpointer saves time looking for a button in a 9" hole.
Just purchased a simplex and waiting to receive. While I’m waiting on it I’ve been researching as much as I can on the machine. What would be a good setting for hunting civil war relics in moderate iron and trash? Thanks for your help.
Chad