Which is better 1080i or 1080p for video gaming?

The difference between 1080i and 1080p is a subtle one. 1080p 50Hz or 1080p 60Hz update the image at twice the rate of 1080i 50Hz or 1080i 60Hz. For fast movement, 1080p handles image updates rather better than 1080i and tends to avoid image flicker that can be apparent on some interlaced formats.
Whether or not it makes a noticeable difference depends on the television and the game content so it's worth trying both formats to make your own decision.
The difference between 1080i and 1080p is a subtle one. 1080p 50Hz or 1080p 60Hz update the image at twice the rate of 1080i 50Hz or 1080i 60Hz. For fast movement, 1080p handles image updates rather better than 1080i and tends to avoid image flicker that can be apparent on some interlaced formats.
Whether or not it makes a noticeable difference depends on the television and the game content so it's worth trying both formats to make your own decision.