The CTX is better than the E-Trac by small amount in every catergory. I don't have an X-Terra so I can't comment on that.
Ignoring costs.... If you want something almost equal to the CTX, and won't require learning a whole new machine, get the E-Trac.It also has a lot of coil options for it. If you want an E-Trac with a small coil, I would recommend getting either the sunray X-8 or Sunray X-5. If you wan't something to compliment the CTX then get a DEUS. The CTX is a deep, silver killing detector but it's not the best if you hunt in very heavy trash. the Deus is lightning fast and will find goodies in heavy trash much easier than the CTX or E-Trac can.
My personal recommendation would be to get the other CTX coils and a lower rod for each to change out whenever needed.
Ignoring costs.... If you want something almost equal to the CTX, and won't require learning a whole new machine, get the E-Trac.It also has a lot of coil options for it. If you want an E-Trac with a small coil, I would recommend getting either the sunray X-8 or Sunray X-5. If you wan't something to compliment the CTX then get a DEUS. The CTX is a deep, silver killing detector but it's not the best if you hunt in very heavy trash. the Deus is lightning fast and will find goodies in heavy trash much easier than the CTX or E-Trac can.
My personal recommendation would be to get the other CTX coils and a lower rod for each to change out whenever needed.