The Dell Streak is actually a QSD 8650, while the Nexus One runs the QSD 8250. Both phones run on the Qualcomm dual-core architecture: arm9/arm11, with one processor dedicated to linux "apps" and one dedicated to the "amss", aka modem software stack.
I have both devices sitting on my desk here, so I ran a comparison. As I suspected, they are close. Also note that the Dell Streak's resolution is much higher and I'm not sure how/if the benchmark takes that into account:
Linpack (higher is better):
Nexus One: 32.94 MFLOPS
Streak 2.2: 33.373 MFLOPS
CaffeineMark (higher is better):
Nexus One: 5587 (rank 124)
Streak 2.2: 5738 (rank 109)
An3dbench (no idea how scores stack up):
Nexus One: 4746, Fill rate = 10MP/s, Game level FPS = 24.87
Streak 2.2: 4495, Fill rate = 17.65 MP/s, Game level FPS = 32.26
I have both devices sitting on my desk here, so I ran a comparison. As I suspected, they are close. Also note that the Dell Streak's resolution is much higher and I'm not sure how/if the benchmark takes that into account: