Rogue Thief for me. Assuming we get Bard, and the right "prestige classes", assuming they're still a thing, I want to recreate my Bard/Assassin/AA from Neverwinter Nights. Should be fun in this setting, if I can get it.
No Prestige Classes in 5e. The have Sub-Classes though, like the Thief. They wanted to put the focus back on the classes, rather than number crunching to gain a Prestige Class.