I didn't FF no 2 but you asked for experience either way so I hope it's ok for me to reply.
I think I would have found it harder to FF my second than to BF her. When you BF, you can put baby across your knees or a cushion/BF pillow etc and once baby is well latched, both of your hands can be free. That leaves both hands for doing sticker books, playing with dolls, untangling various things from your toddler's hair etc. When you FF though, you can lie the baby in the same way but you have to hold the bottle so you're down a hand!
I've fed both of my kids on demand and both fed about as often and for about as long, the first was FF and the second was BF, so I don't think it'll make much difference, apart from only having one hand free when you're FF and having to spend time doing bottles when you could be playing. You can BF in a baby carrier too, which is great when you're out and about with your oldest - no need to stop to sit down when the oldest just wants to be on their way!