That's not a bad analogy... they all have strong points, and weak points, but that's pretty much everything in the universe. My Echo CS-590 has a bigger engine than my Stihl MS-261C-MQ but I prefer the 261 up in the tree and like the 590 on the ground. Something about the weight, balance and shapes of the two saws lends me to prefer them for different tasks. The Echo obviously has more grunt to it, with the bigger engine, but the difference in cutting speed is almost nothing... it just doesn't notice the hard/sappy/pithy/knotty parts of bigger wood as much. They're both 20" bars, at the moment. I might put a 24" on the Echo. I don't think it will notice. We'll see.
Lots of good saws out there, in my opinion. The little Tanaka tophandle saw has been the biggest surprise. I got it as a backup for the MS-201T and I really like the little bastard. At only $215.00 out the door, I wouldn't hesitate to buy one if I couldn't afford the Stihl, Husky or Echo tophandle machines. My expectations were not high for a saw at this price point, and I haven't had it long enough to know how it will hold up, but I might just try to give it a decent workout this year and see what it's made of.