Well, I could be wrong, but I suspect Europa actually MIGHT have FAR MORE going for it, in terms of possible life, as compared to Enceladus...

including the fact that the Europa's near neighboring moon, IO, constantly bathes Europa's surface with A HUGE RANGE of complex organic chemistry, that then passes into the ocean below, steadily, for large time-spans.

I also suspect that Europa could likely support/sustain larger, more complex, and more diverse possible alien-life-forms, and biosphere.

As an added bonus: Europa is also has a MUCH LARGER ocean/sea as compared to Enceladus, increasing the probabilities that some kind of initial chemical reaction to produce early life might occur.

Thus, again... I could be wrong about this, but from what I've read, it seems that Europa is MANY times more favorable, as a possible location of alien-life right here in our own solar system.

As an added bonus, Europa is MUCH closer to Earth, making missions to Europa easier, closer, and less time consuming to reach, as compared to Enceladus.

But... Europa does happen to have one BIG strike against it: high salinity: lots of salt. It's a far more salty ocean, than Earth's oceans.

However, to quote Jeff Goldblum: life often finds a way.

So fingers crossed, and hoping for that first snapshot, when a NASA sub melts through Europa's ice, plunges into the ocean below, turns on it's navigational motors, and bright spot-lights, and depth finding lasers, and suddenly sees something swimming right towards the camera...