Funny, we actually used rolls for abilities when my group first started and eventually swapped to point buy. Point buy imo works better for character creation since you don't rely on luck and get to customize your abilities how you like. The other was array I think? Pre-setup numbers you slapped into each ability, no one really liked array in my group so it was never used.
Another main benefit of point buy imo is to make sure one player's character isn't overpowered compared to another player's character (and thus making the latter player unhappy).
In a video game, where lots of us will be playing solo, why not allow us to roll for our stats?
