Dude cubes are like cheating, just like scrolling and link skills. You should join in in makken a perma beginner solo all quest n boss no clown!
According to all known laws of gear-crafting, there is no way a cube should be able to pass. Its odds are too great to get its succession rate into the positive. The cube, of course, succeeds anyway because cubes don't care what we think is impossible. Red, black. Red, black. Red, black. Red, black. Ooh, Violet and green! Let's shake it up a little. Whales! Cubes are on sale! Coming! Hang on a second. Hello? Buddies? Guild? Can you believe this is happening? I can't. I'll pick some up. Looking smart. Use the discount code! People on reddit told us about those! Sorry, I'm excited. Here's the buyer. We're very proud of you loyal customer. A perfect transaction history, all cubes. Very proud.
I was told funposting is a no no so I will give a serious answer after much discussion: red if you don't care about the lines or are below legendary black if you care about the lines and are at legendary
Heard somewhere on the net that black cubes had 6% more chance of tiering up than reds so they're practically useless.