Both are encompassed by this: 'The horse is prepared against the day of battle: but safety is of the LORD.' (Proverbs 21:31) Cromwell said, 'Put your trust in the Lord, and keep your powder dry', perhaps paraphrasing the verse. So we can have our horses--or B2 bombers--but the Lord is sovereign.
Note, the headline is misleading - the B-2 is not a supersonic aircraft; here, it is probably *near* the speed of sound in humid air.
At such high subsonic speeds, air can go supersonic in various places around the aircraft, even if the plane as a whole is not.
The B-1B Lancer is our only supersonic strategic bomber (max speed Mach 1.25); the old B-58 Hustler (an example is on display at Pima Air Museum) could exceed Mach 2 but was too expensive & hazardous to operate.