construction - IMO, the Howa with its flat bottom receiver and massive recoil lug. Bolt body hasthree gas vents to redirect gasses away from the shooter should a ammo failure occur. The bolt is made from a single chunk of steel which includes the bolt handle.

Magazine system - Flip a coin, they are almost identical to each other.


Maintenance - General cleaning and maintenance their isn't a hill of beans difference.
EDIT: see below about the bolt disassembly.

Extractor - Definetly the Howa by leaps and bounds. The M16 / AR15 style extractors are about the strongest made for a push feed bolt and IMO is even superior to the famed Sako extractor.