Pass X-2.5 -vs- Pass Aleph P, What Differences?

Hello,
This thread is for people who have owned, compared, or heard both of these preamps:
What are the sonic differences between the Pass Labs X-2.5 and the Pass Labs Aleph P preamps?
What are the sonic advantages and disadvantages of each in comparison to one another?
Which is overall the most detailed and transparent?
Which is the most neutral?
Which has the best bass and dynamics?
Which has the best top-end air and extension?
Thanks for your responses!