Thou shalt not express the echo in the same league as the stihl or husky.
Unless you simply don't know.
I have a 590 (close enough) and an OE 362 ( not a "turd", btw) and have run a couple of mtronic 362 and autotune 562's briefly.
Buy a 620 if a saw's handling, throttle response and powerband don't matter to you. My 590 is a decent saw, but is certainly not thrilling in any way, shape or form. In fact, I prefer my supmix china saw by far. Imagine that.
The 562 and 362, on the other hand, are true pro saws. If you've never run a true pro saw, then you don't know that the echo should not be included in this list of three as an equal saw (if that was the intention ?). It simply is not.
If you want the highest performing, best handling saw buy the husky or stihl (doesn't matter).
There's always a reason certain models stick around after their successor shows up...
Like the 372 husky and the 461 stihl. Their replacements had a hard time "replacing" in the minds of the professionals. Like the 362 vs the 400..