Update: The Presonus wins. (Focusrite for sale)
I went ahead and downloaded the latest Universal Driver, and while it does increase latency at 128 buffers (9.7), it is far more stable with my machine than the Focusrite, and at 64 buffers has a rountrip latency of 5.3. (the Focusrite was 7.9)
This is at 24bit 48khz.
I'm interested in what the new IK Axe I/O latency numbers are, because the rest of it looks very nice.