Hey all.
I'm writing this for two reasons, one just as a note of my experiences and two as anecdotal information for those with newer juggernauts who are wondering which companion would best compliment their style of build - essentially a tank build out in PvE, questing and soloing.
One quick proviso:
My character Balt on Lord Adrass has only reached 35 at the point I've written this due to a case of alt-o-holism, and life being life - as a result I won't be able to comment on companions past Jaesa at this point.
For me, I wanted a character that was built to run the important role of keeping aggro and staying the team and myself alive through experienced play and survivability. I was very glad to see that companions made this also a viable role for reasonable speed solo play in SWTOR. Its not that you can't do this in other MMOs, but it tends to be a very slow progression. So, 1 point for Bioware here.
Anyhow, on with the show. My impressions of the companions in two parts - initial impressions, and my feeling on which one suits solo immortal players the best, and why as best as I can state. I am assuming all the companions are reasonably and comparably geared for the point of discussion.
Vette
When you first acquire Vette as an active companion, she should feel OverPowered. Its terrific. The two of you are hell on Korriban, good times. You notice quickly that she can pull aggro, and will likely inspire you to put to some use your aggro gathering skills.
Quinn
Your first healer. Again, for the first few levels after you acquire him, you feel unstoppable, like bounty hunters as soon as they get Mako pre-10.
Jaesa
Close range dps, psychotic combat statements if you have her as a dark side version. I didn't get that 'juice' I did from the previous two when I acquired her, it was more of a style change, the OP nature of the others had indeed started to feel less dramatic as I progressed to new planets.
I'm on Taris now, so I'll soon be getting the range tank fella I hope, but either way I don't have him yet. Onto which best suits solo immortal quest runners.
A little background before the punchline.
I noticed by Alderaan(sp?) that the game was starting to step up more stiff opponents, with more strong mobs, elites not being too uncommon and champions(uber elites) hanging about in various spots. By the time I reached Taris, it felt as it had leveled off, but I shouldn't fall asleep at the controls, as my targets weren't all papier mache' anymore.
So, here it is.
In my opinion, Vette is the champ.
Why?
I find when I play with Vette, I have the lowest downtime of all three.
Why is that?
With Quinn, his healing quite frankly isn't terribly strong, and fights go on a long while - I often would still need to channel hatred after a mob cluster scrap to heal the last bit.
With Jaesa, I was thinking she might be superior to Vette as a dps companion because she was generally close, and I could keep track of what she was doing, and bail her out a bit faster than when I had to turn around, run back to 'peel' aggro off Vette.
In practice, Jaesa was getting herself into much more trouble than Vette was, attracting multiple mobs to say hello to her face with their fists. I found I was spending more time per fight using aggro gathers then when I used Vette, which slows down the battle a bit.
Vette generally only aggro's one target, which is manageable. She can get into bad spots, but generally if she's got one threat after her, you have time to wrap up what you're doing, THEN go bail her out - and she'll very likely be at a safe enough health point that there's plenty of time to 'peel' aggro back to you.
In conclusion, while Quinn can keep you going you should expect longer fights, Jaesa can do solid dps but gets herself under fire a bit more than you may like. Vette is my winner because she makes up for what you lack as an Immortal Juggernaut - 'teeth' when it comes to strong dps, AND keeps herself generally safe.
I'm not an elite player, but these are my impressions and recommendations. I hope this helps other part time players with immortal spec Juggernauts who are wondering about this.
Now, back to play with my wiseacre companion!