German: The 98 Mauser. Accurate, reliable, durable, and a lethal caliber
American: The 1903 Springfield (actually copied from the above Mauser. All the attributes of the rifle it copied (said Mauser) plus a new caliber , the 30-06, that would become a universal favorite of military and hunters alike.
Beyond those two I'd only be speaking from what I've read or heard as I have no personal experience with others (although the reputation of the Lee Enfield suggest that it would be the British rifle chosen)