Pokemon Silver(and Gold) are the cream of the pokemon crop, and a true succesor to Pokeomon Red and Blue
Anyway the game is a lot more advanced and balanced than its predecessors. Psychic Pokemon were too strong in R,B,and Yellow, but the new Steel and Shadow type pokeomon can handle them. Of course there's a lot of new pokemon for you to capture and fight.
There arent a whole lot of diffrences between Silver and Gold. So only pick both up if you're determined to own all pokemon. These poke games are excellent but as i stated before, i feel Gold and Silver are the cream of the Crop.