If breastfeeding mums seem more tired etc, it’s because they may not getting much help and support with general baby care and house hold stuff. Sometimes family leaves everything to mum because they think that they can’t do anything because they can’t take the baby for a feed.
Overall breastfeeding mums get more sleep as there’s no getting up to make bottles in the night, and breastfeeding releases oxytocin which helps you get back to sleep. Lots of comments here about FF meaning others can feed/bond with baby, but newborns actually need a main carer and a secondary carer, not a whole extended family passing them around like a doll. Newborns need to form secure attachments with their main carers, mums do this mostly by breastfeeding, but the other parent can do this by bathing, changing nappies, cuddling, baby wearing, rocking, singing, contact napping etc.
Statistically speaking postpartum depression is more common in artificially feeding mums, as well as the other health risks to mum and baby that increase when artificial feeding.
You can go to your local breastfeeding support group before your baby is born and talk this through with trained peer supporters and other mums. Learn about proper positioning and attachment and you shouldn’t get sore nipples (unless baby has a tongue tie) and engorgement is worse if you don’t breastfeed because your milk will come in anyway, and until it goes away your breasts will be sore. Feeding will reduce the engorgement.
Sometimes artificially fed babies seem more ‘chill’ but it’s often due to them being very full from overfeeding. Paced bottle feeding is still not universally practiced, so most people encourage baby to finish a whole bottle, then baby is in a food coma and conks out. Babies are not meant to be low maintenance, and hands free. They need lots of interaction and physical contact, the idea of scheduled feeds with baby being fed-burped-changed-put down is very outdated, the NHS now encourages responsive nurture and feeding on demand, even if you’re not breastfeeding.
I’ve been an infant feeding peer support volunteer for 20 years, and can help with all kinds of evidence based information, not just “I did this with my baby and they turned out ok” anecdotes. I hope this helps.