Breastfeeding is the biological norm for human babies and formula is adequate but clearly it's not going to be able to beat it from your baby's perspective. That said, of course, having a safe alternative to human breastmilk can literally be a lifesaver.
If you do decide to go down the formula route I would recommend giving a low protein formula with probiotics or supplement with probiotics. They are just discovering just how important the "good" bacteria in your gut are, and those early months are pretty crucial. Your breastmilk will provide your baby with those specific bugs as well as antibodies, nutrients and a whole host of other goodies tailored to your babies development needs but formula fed babies tend to have different bacteria in their gut which may be one of the reasons formula feeding is associated with higher risk of obesity and diabetes and other problems later in life. So, baby probiotics can help mitigate that risk.
I know you didn't ask about the "science" of it but the probiotic thing isn't often talked about so just wanted to flag it.
From my personal perspective, breastfeeding has been wonderful. I discovered cosleeping with my second baby and got so much more sleep because she just latched on and snuggled in. I found it really hard to even make a cup of tea after I had my first so being able to just pull up my top and feed the baby was great! Be warned though - newborns feed a lot. It's normal and it doesn't mean you aren't producing enough milk. It's really common for people to start supplementing with formula because they worry when their baby has been on the boob for ages and then seems hungry almost immediately. Don't worry. It's supposed to be like this and it won't be like that every day for months! They are literally telling your boobs how much milk and what type of milk to produce and particularly in the first 6 weeks your body is building the supply. If in doubt, whack them on the boob. It's the ultimate comfort food! Hungry? Tired? Sad? Have some boob. It's magic. And it feels lovely once you get the hang of it.
On the figure front, pp have already said that it's pregnancy that affects your figure. For me breastfeeding has been wonderful for weight loss. I was a slim size 10/12 before pregnancy but am a full stone lighter now after 2 children and 4 years of breastfeeding. It doesn't happen that way for everyone and it takes your body a few months but your body literally stores fat during pregnancy in order to produce milk so it helps to burn that up.
I have can recommend a book called "The Food of Love" which gives a good overview of how to breastfeed etc. It's also really funny and easy to read!
The Politics of Breastfeeding is also a good read but that's more about the cultural issues we have in this day and age about breast vs bottle.
Finally, if you want to learn more about the probiotic thing I recomment a book called "Let them eat dirt" written by two microbiologists (and parents) and which covers the latest research.
One final point. If you do decide to breastfeed (and I hope you do) then make sure you get support early on. NCT has a helpline as do La Leche League. Speak to them in advance and suss out where your nearest laceration consultant is. Maybe even give them a ring and discuss what breastfeeding means etc and then if you are having any problems or have any questions you know where to go for reassurance and guidance.
Good luck OP and congratulations. Well done for doing your research into all of this. It sounds like you are going to be a fab Mum!