Jolida 302BRC with 6 ohm speakers

Ok. I have another stupid newbie question. I bought a Jolida 302BRC and some Wharfedale Diamond 9.1 bookshelf speakers. However, the Jolida amp only has 0,4 and 8 ohm posts on the back of it. Which one would sound the best and would be safe to use with these speakers? I'm kinda clueless at the moment...Thanks!
Both are completely safe.
Each may have some advantages.
Listen to both for a while and decide which you like better.