Get a travel shaft for the Excal and take the Equinox as a backup, if you have waterproof headphones. I have over 10,000 hours with the Excalibur and less than 100 with the Equinox in salt/fresh water. I more I use the Equinox, the more I learn and the more I like it. Each has their own strengths and weaknesses. No one detector can be the best in all situations. Plus you should travel with a backup if you are serious about a detecting vacation. Don't forget to take the necessary parts and spares.
If you are down to one...try a DectorPro Underwater, not bad, different and fun.
And if the environment where you plan to travel to is such, a PI might be in order. The White's Surfmaster Pro or Dual Field or a Garrett Infinium.