we are able to click the link for download SP2 when installing the indigo,so the Indigo is better than avalon much.(as the twig is bent, so grows the tree')
They're both betas. If you prefer the fact that Indigo gives you an easy link to SP2 wheras Avalon doesn't then file it as a bug report for Avalon. The whole point of trying out pre-release software is to get them to make changes like this while there is still time.