Well, I haven't run nor worked on everything that is out there, but I can share my personal lineup. I run a 50-70-90cc plan for most of the work I do.
35-40cc, Stihl 021. Yes, it's a clamshell. Yes, its slow. I have a soft spot for the 021 as it was the first saw I ever owned, and it was good to me. I turned it into an 025 when I found out I could. That saw now belongs to my brother, but I have another one that I brought back from the dead.
50-55cc, Stihl MS260. Mine pulls and oils 20" .325 bar reasonably well, and has good grunt with just a muffler mod and timing advance. It's often my "one saw" solution for small jobs or small firewood under 16" in diameter. It isn't fast, but it's reliable and paid for.
60-65cc, Jonsered 630. Mine has heated handles and happily pulls a 24" bar buried in anything I've encountered. I feel like it has more torque than 62cc should, and keep considering having it ported.
66-72cc, this is kind of a toss up. I have a healthy Mcculloch Pro Mac 700, which I use frequently, and a newish 372xp XT. I use the 372 if I'm gonna be cutting all day, and the 700 if I'm only cutting for an hour or two. I'd run the 700 longer if it had antivibe, I just love the sound it makes
77cc- I don't own anything newer than David Bradley saws in this size- I haven't seen the need so I haven't satisfied the "want" for something like a 461.
80-89cc, I only have one "practical" saw in that size, a Pro Mac 800. It's alright, but I'm not in love with it.
90-99cc, Husqvarna 395xp, ported by Randy. Pulls a long bar very well, oils great, and is just a pleasure to use. It has done some milling as well, and performed as expected.
100+cc, I don't own anything that isn't "vintage" in this category that I would go out and run for long periods of time. My Pioneer 650 is a cool old saw, but I wouldn't take it with to fill the trailer with firewood.