Husky and Jonsereds are the same engine in a different wrapper, exactly as in your truck comparison. Some feel the J-reds are assembled with a bit better fit and finish, and are less commonly encountered than their Husky brothers, mostly due to a smaller dealer network than anything else, which gives the Cadillac analogy. Most consider them to be better looking in red and black than the all orange Husky saws.
You'll pay a little more for a 2171 than a 357, but it will have far more torque than the 357. For small wood, the 357 will keep up or possibly even be slightly ahead, but as the wood grows larger, the 2171 will pull away, especally with increasing bar length. That's the difference between a 60 cc class saw and a 70 cc class saw, 70cc will give more torque and hp, and be better able to pull a longer bar in bigger wood. The 60cc saw can be tuned to have the same power output, and may cut quickly due to high chain speed, but the torque will be lower, and it will not be as happy with longer bars and bigger wood. Buy the right size saw for the wood you cut and the bar you need to pull, or deal with slower cutting if the saw is a little smaller.
Downside? It's a little tougher to get to the air filter...but you rarely have to clean it anyway...so that's a moot point.
