I personally think f/t is more convenient, because I only offer for about 20 minutes regardless of the method of feeder. If he doesnt hit it within a half-hour, he's just not hungry. If he doesn't feel like eating that week, I can pop a dead rat in the freezer no problem, rather than maintaining the livelihood of a rat for another week (and possibly falling in love with it in the meantime, because rats are my favorite creature next to snakes lol.)