As well as everything mentioned by PPs, it also depends what exactly you're hoping for from those first six months (or first year) with your baby. If you want your independence, need to go back to work, don't want your life or relationship to be altered and to completely negate your every need in favour of that of your baby, then FF is easier, without a doubt. If you want to spend hours sitting feeding your baby, holding them when nobody else can, giving them something that nobody else can, savouring all those moments - the hard as well as the romantic, when 3am exhaustion hits and it's just you and your babe awake and life goes fuzzy round the edges, well, then bf will win out even if it seems harder sometimes.
I admit it caught me by surprise the first time, how much my baby needed me, and that was fucking hard, even when the initial physiological issues were over, but in the long run that was my reward, too. I'm more prepared for it this time round. Yes, BF has benefits in the ease of preparation, cost, portability etc, but it's not as simple as easy versus hard, BF versus FF.
I am looking forward to BF DC2, even whilst I slightly dread the relentlessness of it, but I hated the FF we had to do. I hated faffing with bottles, worrying about germs, temperature, trying to warm bottles when I had a screaming baby, handing my baby over to DH and feeling like I should be doing it even though he technically could (and wanted to). It doesn't feel like a choice to me, so even if BF is harder at times, and I wish I could unequivocally say it was easier, because I heartily believe in it, it's still how I will feed my baby.
Whoops. Sorry for the essay. Pregnant, watching children in need and feeling emotional.