Solo Play: Half-elf Lore Bard. From my limited playthroughs so far, skills seem to be important in giving you options to explore to really enjoy the depths of the game. This will give me the most options, I think.
Group Play: I'm going with a melee build. I'll look at what my partners elect to do and then pick a melee class that can give us the skills we're missing. It might be my Great Weapon Gloomstalker Build, a Vengeance Paladin, or a Sword/Valor bard (depending upon whether I want wisdom, charisma or intelligence skills).
I'll wait for the inevitable DLC that takes us to 20 and adds the rest of the subclasses to play a Hexblade or my Archer combo (GloomStalker 5, Cleric of Order 1, Divine Soul 5, Battlemaster 4, Assassin 3, Divine Soul to 7).