As of BETA2, two versions are distributed, the 'CAF' version and the 'Makozomi' version.
CAF (Code Aurora Forum):
This version uses the CAF display driver, which in general has more fixes and the newest qcom stuff over the AOSP one.
+ MPD composition and overlay drawing should be improved using this display driver
+ Code widely used on non-nexus devices
o I have yet to investigate how it fits our MDSS writeback implementation
- HDMI is broken
This version uses the AOSP (Mako/Nexus4) display driver, which in general is not up-to-date with the newest qcom code, but proven to be stable over time.
+ HDMI works flawlessly
+ Pure Mako/Nexus4 drivers
+ Proper use of the MDSS writeback panel instead of msm_fb
- MDP composition and overall drawing performance could be a tad worse compared to CAF
The choice is yours.
If you rely on HDMI, Makozomi will serve you well.