Nobody is going to answer fairly by design- most are going to answer by their own favourites.
If you have only ever owned half a dozen saws, all from the same manufacturer and burn less than 5 gallons of fuel through them per annum- you will be bias to what you know.
By design? For every answer, there is an alternative that might be just as suited for another user.
But design wise.....
1: Stihl Contra
2: Husqvarna 162
3: Stihl 200T
4: Jonsered 2094
5: Husqvarna 357/359
Sure, that list is biased to what I own, use, have experience with, what I was exposed to over the last four decades of saw use and my geographic location, species cut. If I were a couple of decades older, there might be some big American and Canadian (or Canadien?) saws on that list from when we could still cut native trees here.
You could list by CC rating, or by type, consumer or pro- top 5 is perhaps too open of a question. In the "modern" era and top handle list- it would be hard pressed to put any saw above the Stihl 200T on any top 5 ranking.
Ranking on popularity, it would be hard to not list the early Stihl 066 or Husqvarna 372.......