Retrieving link juice from old domain

[AlyLauren]

Well, it depends on the link. As we know, with 301 redirect about 95% of link juice is being passed on. Therefore if a backlink is spammy, 95% of its "spaminess" will be transfered too. Again, it depends on the quality of backlink. I say look at old domain backlink profile, disavow all bad and spammy links and after it's disavowed do domain redirect.

Again, it depends. If all the content from all websites is related, not duplicate and good quality - it is better. You would basically just combine all the goodies in the same spot. However, if content is not related, bad quality - you gonna get one huge dump instead of several small ones I prefer small dump which are less noticeable