I guess in order to transfer the link juice of one particular page to another particular page page level redirect is a good idea!
redirecting images URL is not really a good idea unless you have insanely great links on your image URL page and you really want to transfer the URLs link juice to the same image on other website (not really a case of the real world!)
If Link Juice is something you don't care about, go for a domain level redirect as i am getting a feeling that both website have similar structure and if you want to properly transfer the link juice from one URL to the similar URl of another website, try page level redirect!
Remember, Try to reduce the number of 301 redirection as this might increase the page load time which has a negative impact on SERP rankings.