Well, I've never used any of the hosts you mentioned, so I'll try to compare the basic plans provided by them.
Dreamhost:
500GB disk space
5TB bandwidth
$5.95
support: help desk, dreamhost support wiki
uptime guarantee:failed to find.
set-up fee
Quote:
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There is a per-plan one time setup fee of $49.95 for all shared hosting packages, and if the customer wishes to cancel DreamHost shared Web Hosting services within ninety-seven (97) days of the initial signup they shall be able to do so for any reason (aside from disablement for Terms of Service or Spam Policy violations) and have their money promptly refunded.
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A2hosting.com offers
10GB disk space
100GB bandwidth
$24.95
support: help desk, tutorials, knowledgebase.
uptime guarantee:99,9%
no set-up fee.
I think while choosing between them take into consideration your site's requirements, do you think you might need 500GB of disk space? If so, go for Dreamhost.com. If you are going to host just one site, then a2hosting.com plan will give you more stability, as I think that an average company can guarantee you more stability in making backups.
Try to check both companies' support response time, it might also help.