This is my first post here and of the 5, I pick the M1 Garand. I have also owned all the above and other WWII rifles. (G43, M1903A3, M44 Nagants, M1 Carbine) The US was the only country prior to WWII adopt a semi auto rifle, all others continued to equip with WWI rifles.
However, the M1 is not the best rifle to come out of the war. That goes to the MP44/STG44 series rifles that still define rifles today.

This is me shooting a MP44 in Iraq in 03' with some East German 7.92x33mm ammo. On my hip is another WWII relic (M1911A1 Remington-Rand dated 1944) and at my feet a preWWII Czech BRNO 98/29 7.92x57mm built for Iran.
The task of any infantry soldier is to close with the enemy and destroy him with the most violence in the quickest amount of time to take and hold ground. Most infantry engagements are less then 300m. Squads use fire and manuever to close with the enemy and usually have other weapons(ie machince guns, rifled grenades, etc)/combined arms to back them up. This hasn't changed and the MP44 characterics (AK47, M16/M4 sereis) are still being used in Iraq and Afganistan today.
I base this observation and option based on 24 yrs of active Special Forces duty (recently retired), paratrooper, combat diver, M1 tank qualified, sniper, All Army Match competietor (M16 and M4 to 600yds and M14 to 1000yds, all iron sights) and combat vetren from Iraq in 91, 03,04,05,06,08 and 09'.
Just my .02