Confused about which Hadoop distribution to use

Playing around with Hadoop a little and I am completely confused about where to start:

• Apache Hadoop.
• Hortonworks.
• Cloudera.
• Pivotal. Not yet available publicly but early access program available
• Intel. Probably the standard licensing restrictions on Intel software, probably not viable.
• AWS. Except I want to host locally.
• And yet more distributions.

More confusing than choosing a linux distro.