If it were me, I'd buy another Pacific Salt (Planning to this year, actually).
The Endura 4 is a very nice knife, but it's a different knife.
For me, there are three main drawbacks comparing the two knives.
The first is the handle shape on the Endura 4 does not work well for me. The ergonomics are different. If I grip with my first two fingers in the first finger groove, my hand is cramped. If I grip with just my index finger in the first groove, my hand sits too far back.
The Pacific Salt on the other hand feels right every time, with my index finger in the first groove.
Second, no variation of the Endura is rust proof (Though the DLC versions come close).
Lastly, it's also a little over half an ounce heavier.
Now, if weight and corrosion resistance don't matter much to you, and you find the handle comfortable, the Endura does offer a lot of benefits.
The handle texture is very nice, quite grippy. There is also jimping on the handle behind the thumb ramp, which a lot of folks like.
There are tons of steels to choose from. They might not be rust proof, but you have a lot of options like VG10, S30V, VTOKU2, HAP40, etc.
There are also factory waved models, and versions with G10 scales, stainless steel scales or wooden scales.
The E4 is a knife I've given many chances, a knife I wanted to like, but in the end the handle shape change makes it not work for me. Hopefully that isn't the case for you.