Silver Surfer has the power cosmic, which makes him stronger, faster and tougher than Black Adam! Plus Surfer has long range attacks, Black Adam has to shout Shazam to generate lightning, and he must be in close proximity of his opponent to cause damage, and even then, he runs the risk of turning back into his mortal form. Silver Surfer can rearrange molecules, he can alter the molecules around BA and turn them adamantium (which he has done against Carnage!)! No matter how you look at it, Black Adam is toast! Too bad BA doesn't have an enchanted hammer that he can use to block the Surfer's powers....unlike Thor! That's why Thor has more wins against the Surfer. Black Adam or Superman goes down to the Silver Surfer!
Both BA and Big Blue powerful enough to take out even SS if he allows them to make this a slugfest type fight!
And how would SS like magical lightning blasting him?