we do both, and i do notice some of our snakes are more likely to strike in their enclosure and some don't in regards to the feeding in a seperate cage, except for one snake the rest are housed together and feeding seperatly is to prevent accidents not a feeding responce. but when i do put them in the feeding tubs (each one has their own tub with their name on it) they do go into "feeding mode" and get far more aggressive.
it also depends on the kind of snake. our corns don't go into feeding mode, it's only seen in our boids, the corns just sort of mosey up and eat their prey (heaven for bid they ever had to kill something). the boids (except one) all snatch the prey out of our tongs, don't forget to count your fingers afterwards.