The increased damage from Exhaulted Smite does not make up for the reduction in the number of Extra Smites over end fight durations (which is where you would think this helps the most)
If you take Exhaulted smite you get the same number of smites. Each exaulted smite adds an additional smite use according to the devs posts.
Former Host of DDOcast
Member of The Madborn of Thelanis
Streaming sometimes on twitch as SigTrent