Hi OP, I’m also a breastfeeder but respect women’s capacity to make choices based on their own review of the evidence.
No formula-feeding mums will be able to tell you of any positive or negative health effects on their individual baby, because a single person can’t be a robust scientific sample. What you will get is plenty of anecdotal stories of mums saying ‘well I FF and my baby is fine/you can’t tell which were BF or FF by the time they’re 12’ etc. In fact, studies now show that you can tell the difference, but only if mothers have breastfed to at least 2 years and various other factors come into play.
If you want a basic overview of breast vs formula in terms of health benefits, a quick Google will bring up public health information from the NHS and the like, and then there are studies like this one which give a more in depth insight: www.ncbi.nlm.nih.gov/pmc/articles/PMC2812877/
Ultimately, breastfeeding is the optimum nutritional choice for your child, since it’s tailored to your baby. Formula is typically based on cow’s milk, which babies are not biologically designed to consume in their first year, but can and do adapt to, such that it can provide adequate nutrition.
If you really want to FF from birth, you could consider latching baby (or expressing into syringes) when first born so that they can get the amazing immunological benefits of colostrum. This will prime the gut and may make the transition to formula easier for them. If you don’t stimulate your breasts (ask for milk), they won’t produce it. If your milk comes in on day 3-5 without any stimulation, you can just hand express to relieve any discomfort (and save any drops milk to give to baby?), gradually reducing the stimulation until your body realises that you don’t want it to make milk any more.
I hope you can find a feeding solution that works for you and baby. Good luck!