i have both..and i really like a good looking nem..BUT if u have a lot of coral the nem can get annoying especially in an unstable tank..ive heard alot of people having them move all around their tank..and also u might get a clown fish and nem and the clown wont host the anemone..which is common...if i had to choose between the two i would do a Mandarin..i have 2 in my tank and theyre awesome to watch..and theyre colors are insane! im sure people have nems that dont move at all..but theres no gurantee its hit or miss on them moving and its hit or miss on the clown hosting it..