The following section contains very minor spoilers for The Witcher 3.
If you do decide to simulate a Witcher 2 save, then you're probably wondering what each dialogue choice with General Voorhis actually does. We've broken down the basics below.
Kill or spare Aryan: This decision impacts a main quest later in the game. It does not effect the outcome of the quest, but characters react differently to Geralt.
Side with Roche or Iorveth: This decision makes a slight difference to how certain characters react to Geralt later in the game. It has no lasting positive or negative impact.
Save Triss or Anais (if you sided with Roche): This decision makes a slight difference to how certain characters react to Geralt later in the game. It has no lasting positive or negative impact.
Save Triss or lift Saskia's spell: This decision makes a slight difference to how certain characters react to Geralt later in the game. It has no lasting positive or negative impact.
Save Síle de Tansarville or leave her to die: This decision makes a difference to how certain characters react to Geralt later in the game. It has no lasting positive or negative impact.
Kill or spare Letho: This decision opens up an optional quest later in the game. You must spare Letho for this quest to occur.