It depends on how many German soldiers threw down their weapons and surrendered. As the western armys advanced into Germany they found the resisitance uneven. As long as the German soldiers remained under the eyes of the military police and duty bound officer they fought, but when the opportunity came they usually surrendered. By late April entire battalions were giving up enmasse as the dicipline broke down.

Of course there are examples of pockets of stiff resistance. The defenders of the Ruhr continued to fight. They were not pressed very hard tho. It was enough for the US army to surround the area. There was a hard fight at the city of Kassel. For whatever reason the Germans fought very hard there. The US soldiers reported that many civilians fought alongside the soldiers.

In the Berlin region I am estimating only the fantatics like the SS would resist the British or US advance. Even they might be inclined to fight only until the situation was truely hopless, rather than to death. In reading the accounts of the common soldiers of the Wehrmacht there are many descriptions of the soldiers fleeing Berlin in small groups and as entire units in the hope of reaching the British Army before the Soviet soldiers caught them. Werner Adamcyzk in his autobiography describes how after his artillery battery fired its last cannon rounds at enemy tanks in Berlin the officers ordered the men onto the vehicals and the group drove as fast as possible west. Adacyzk decribed the roads as clogged with Wehrmacht soldiers moving west.

If one of the US armys was to capture Berlin it would probablly follow the same plan as the Soviet commanders. The city would first be surrounded. Then reduced with heavy artillery and air support as was the US armys habit. The sort of casualtys the RKKA suffered taking Berlin would have been less likely in the case of the US Army. Not sure how the British would have acted.