I prefer text. Text allows you to go at your own pace, and imagine how each character sounds in your mind, and the tone in which they say things. How one person might interpret a line of text may be completely different to how someone else would, but with voices there is very little variety. It gives you greater freedom in imagining what each character is actually like. Finally, I find its also helpful when you need to stop the game but the pause button doesn't work - just leave it on someones speech box for a few hours and when you rteurn it will still be the same.