Not enough cards for both players when casting Wheel of Fortune
Here are the relevant Comprehensive Rules:


  104.3c If a player is required to draw more cards than are left in his or her library, he or she draws the remaining cards, and then loses the game the next time a player would receive priority. (This is a state-based action. See rule 704.)


Nothing happens until a player would get priority, so the order in which the players drew the cards doesn't matter.


  704.4. Unlike triggered abilities, state-based actions pay no attention to what happens during the resolution of a spell or ability.


All the SBAs are performed simultaneously.


  704.3. Whenever a player would get priority (see rule 116, “Timing and Priority”), the game checks for any of the listed conditions for state-based actions, then performs all applicable state-based actions simultaneously as a single event. [...]


All the players would lose simultaneously if it were not for the following exception:


  104.4a If all the players remaining in a game lose simultaneously, the game is a draw


In both cases, the game ends in a draw. Because the rules pay no attention to what's happening during the spell's resolution, having more cards doesn't protect you in this case. As soon as state-based actions are checked (i.e. after the spell resolves) you both lose the game at the same time and it's therefore a draw.