Obama was better than Biden, honestly
Biden is more effective and much better on foreign policy
They're similar on foreign policy, I'll grant you that Biden is better at working with Congress than Obama was. It's mainly on domestic/economic policies where I think Obama did better.
Biden has a more coherant foreign policy and acts more decisive than Obama. Particulary on Russia and the PRC.
Biden also has been more effective to maneuver bills through congress than Obama, despite narrower majorities in his first years in office (although Biden was lucky to have a more ideologically united caucus than Obama as there were still a lot of Blue Dogs back in 2009/10). Also seems to me Biden and his team learned their lessons from the Obama years as to how to treat GOP obstruction.