I currently own five Alembic basses - a Series II 5-string, a Europa 5-string, a Stanley Clarke Sig Deluxe 4-string, a custom 4-string with Signature electronics and a Rogue 4-string. I have also previously owned a Spyder.
Of the five, the Series II is by far and away the best sounding bass, but it requires some exploration to find the perfect tone for a given purpose. This is not an issue if you have the time to dial it in - and, rest assured, you WILL eventually get the tone you're seeking. I've used it live with great success, but the tonal range that was required for the performances when I used it was pretty narrow, so I was able to pretty much set it and forget it - bumping the treble PU volume a bit if I needed to cut through and bumping the bass PU volume a bit if I needed more girth.
The Europa and the Rogue are the easiest to pick up and just play - I don't have to mess around too much to dial in a wide range of tones that would work for everything from country to rock to funk to pop. The Europa electronics, which are standard on both models, are a breeze to use in a live setting.
The two basses with the Signature electronics (and the Spyder with Anniversary electronics) fall somewhere in between. They are little more tonally versatile than the Europa electronics, but require a little more adjusting to get to where you want to be.
Re: choice of Alembic for you - I would advise approaching it from the standpoint of how you intend to use it. If you are primarily going to be playing in a controlled environment and recording - get a Series. IMO, there is nothing better out there for that purpose.
If you are primarily going to be playing live - I'd strongly consider a Europa or a Rogue. In addition to allowing easy access to a wide variety of tones, they are also very balanced and comfortable instruments to play when standing for long periods of time. Example: during my most recent bass gig, I played standing for almost three hours straight (with no break) and suffered no repercussions from using my Europa 5.