Which distribution of Drupal to use NOW - D6 vs D7 vs Pressflow vs Acquia

Track: 
Implementation and Config
Experience: 
Intermediate

Drupal 7 RC1 is out - zero critical bugs! That's awesome, we're all waiting for that.

It's great, it has tons of new features, its been years in the making and its the future of Drupal. Should you use it for your next project? Many of the best modules from D6 are not core, but what about the rest? There are no critical bugs, but are you able to support any bugs that surface during implementation?

Launching a high performance site? Ok, then its Pressflow... or Acquia. Whats the difference?

So why not just go with D6? Won't we just have to migrate to D7 in a few months?

Choices choices.

Intended audience: 

Anyone who has heard of any of PressFlow or Acquia drupal. Anyone who is wondering which version they should build the next site on.

Questions answered by this session
Question 1: 
What is the difference between D6 and Pressflow.
Question 2: 
What is the difference between D6 and Acquia drupal.
Question 3: 
What do I need to know to support D7?
Question 4: 
Historically what were the rate of adoption of D6 and rate of modules upgraded and supported for D6?
Question 5: 
What are the best cases for these distributions?
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