Hey everyone!

As the title suggests, what do you all think is the most optimal build at level six, stats will be 4d6 rolled, lowest dropped and we're starting off in a prison. I already have a character, a totem barb from a previous campaign my DM said I could bring in that I really want to play, but he said we should all make a back up just in case, cause he won't be pulling his punches and an escape is pretty darn difficult to pull off!

Given the context, how can I make my back up character have a greater chance of succeeding in this endeavor? I'm thinking Rogue cause prison escape gives me roguish shenanigans vibes. But I'm not sure! Multiclassing is allowed of course, and we can only use content from official sources, not homebrew or UA!

Thank you guys so much in advance!