Live dealer games are streamed from a studio with a real croupier, which removes the question of whether the shuffle was fair in a way an RNG table cannot. The studio behind the tables matters as much as the casino carrying them.
A live table is a real dealer filmed in a studio, so the cards and the wheel are physical. A standard table game is software using a random number generator.
Evolution is the largest, with Pragmatic Play Live and Playtech also common. The providers each casino carries are listed on its review page.