Siince the OP didn't specify that our choice was limited to current saw production..
My vote has to go to the once great, but sadly departed Homelite. Those that know me won't be surprised. NOT talkin' "homelite" (no CAPS) stuff sold in box stores now. A close second for me would be McCulloch, with Poulan getting third. Again......that's NOT "mcculloch" and "poulan" crap sold currently, but instead the iconic brands of the past. One of the large old Sachs Dolmar saws (such as the mighty 166) would be fantastic to find.
The new stuff isn't my thing..............but I refuse to bash any brands. Run whatcha want. Just save the Old Magnesium for those of us that prefer it. As for the 'modern' stuff, I'd say that the Dolmar and Solo saws are most interesting to me. I'll probably pick up an ex-rental Dolkita and build a 7901 with it someday. I wouldn't turn down a 6800i, 120, or 9010 if it came to me at a bargain price either....