Whichever you choose you will be happy. In my soil its very close. I have 10"-14" targets and they both hit them. Im in east tn soil or about 2-3bar soil. Check out my youtube channel to watch. The Equinox Hunter. Edit i believe youre a sub iffy signals so youve prob seen already.
I'm gonna guess that they are the same in depth. I've got the Kruzer but not the Anfibio. I'd bet the Anfibio has less chatter than the Kruzer at that depth. Maybe by fiddling with the gain and iSat settings you can get the Kruzer to stop chattering in 4 tone, but i rarely go into 4 tone because of this.