You're right - Topol's fly faster, making them more practical.
High apogee? Then it'd be a duck shoot while it's going through that. High is slow.
You can't be fast and maneuvrable. You can't be unobservable at high speed in the atmosphere.
I can see its attraction at an intermediate range for frightening the underwear off India, but the US Navy should have a decent chance of seeing one off.
If the Chinese want to sink an aircraft carrier, then they have an array of submarine assets.