Both are skill based yet former is considered sheer gambling while later is not. Fantasy sports has become norm, while on the other hand if people come to know that you bet on sports you'll be met with eyebrow raise.
^ that's my opinion. What's yours? Do you consider both of them same or different?
You need to perhaps define fantasy sports, because some people define it differently and even casinos try to blur the lines in order to get more money in. You are probably talking about virtual teams that people have put together and you take the statistics from different players to calculate who would have constructed the best team based on key metrics they perform throughout the season? As opposed to the garbage games that casinos create which are meant to replicate sporting activity, like virtual horses or even virtual football games, which just run to some predefined algorithm that squeezes reasonable profitability out for them. Sports betting certainly feels like it has more charm and relies on reading what's relevant on the day.