Some of my favourite games (at least at one point, before they began to wane) are Pandemic and Bang! Both games offer deep strategy and are rich in theme. So why make new games? each one has its own set of expansions that change the way the game plays while still offering a neat package, however there is one thing no amount of expansion could fix... the time. Sometimes all you want is a quick round of Bang! or Pandemic without all the setup and conviluded decision making/bargaining.
Enter... the dice games. I know what you may be thinking, 'Oh no. Dice games, so there is going to be absolutely no strategy and itll all be based on luck'. Well in a way you are both right and wrong. Yes both games rely heavily on how the dice fall, this is of course how dice are intended to be used, but its not to say that the card based iterations of these games arent without there random occurances.
What sets these two apart from there card fairing cousins is the time it takes to complete a round. Sure you could be finished a round of Bang! or Pandemic in under half an hour, if of course the players are well versed in the rules and are making quick decisions, but generally these games tend to linger on longer than the more casual player might like. This is not the case with the dice games, they are by design made to be a quicker, more casual experience.
So which is better? Can you own both? Well I think that really comes down to your playing group. If you have a bunch of super strategic people ready to take on all that the game can throw at them, probably go the full experience. However if you want to introduce the theming and mechanics of Bang! or Pandemic to a wider audience, then definitely pick up the dice games!