Feeding in the regular enclosure is better in my opinion. To me the main two reasons to feed in tank are....

When you feed out side of the tank, you must handle after feeding to put the snake in the original enclosure. This increases the risk of regurgtation and stress on the snake.

When you take the snake out of the environment that has hides and protection, you increase the risk of injury to the animal by the rodent due to lack of cover and stress is increased. Snakes are ambush preditors, so let them ambush.

Also, definately prescent the area when doing a live feeding. It will give you a much quicker and safer feeding