I guess I'm gonna buck the trend and say go with the Garrett, TRX has a small delay when turning it on and off, the Garrett is instant on/off. TRX has a active detect field up high by the on/off button can lead to problems in a deep hole with metal in the sidewall of the hole.
The TRX is deeper, there is no doubt about that and has adjustable depth modes.
My oldest Garrett is over 4 years old, never had a problem.
All the above is just my personal opinion, the TRX and the Garrett both do what they are supposed to.
I would find the best deal on either one and that is the one I would buy.....
Can't comment on the Minelab, never used one.
The TRX is deeper, there is no doubt about that and has adjustable depth modes.
My oldest Garrett is over 4 years old, never had a problem.
All the above is just my personal opinion, the TRX and the Garrett both do what they are supposed to.
I would find the best deal on either one and that is the one I would buy.....
Can't comment on the Minelab, never used one.