[ETR3(SS)]

It was building these goliaths that helped to bankrupt the USSR. There is an old Russian saying/proverb that goes "Better is the enemy of good enough." The Soviet Union built things to do the intended job and that was it, no more. The Typhhon was designed to sit under the polar ice and launch a retaliatory strike up to a year after the initial exchange. Lurking under the ice for that long it didn't need to be sophisticated. As for being the most powerful, that depends upon your definition of powerful. If you looking only at nuclear armament then I think the Ohio class would have it beat there with its 24 missiles.