I am not too sure if I interpret this correctly but Germany and Spain should be the most "powerful" in the sense that they do not need a passport to travel within EU regions but Singapore need a passport to travel to EU. I.e. for Germany and Spain, EU countries are excluded in the counting of the 190 but Japan will include the EU countries in the 193. Hence Germany and Spain can access more countries without a need for a visa.
dumpsternow t1_j58n506 wrote
Reply to TIL Japan is considered the world's most powerful passport, with visa-free access to 193 countries. Singapore and South Korea are close behind with 192 countries. Syria, Iraq, and Afghanistan are the least powerful, all with visa-free access to 30 or less countries. by grandlewis
I am not too sure if I interpret this correctly but Germany and Spain should be the most "powerful" in the sense that they do not need a passport to travel within EU regions but Singapore need a passport to travel to EU. I.e. for Germany and Spain, EU countries are excluded in the counting of the 190 but Japan will include the EU countries in the 193. Hence Germany and Spain can access more countries without a need for a visa.