Hi Bona,
I've had both.
DD was born by ElCS at 39 weeks. She stayed with me the whole time even when I had a mahoosive hypo one night (BS of about 0.8 I think?) and was transferred back to recovery as a result. She did have low blood sugar one night, a MW came and cup fed her some formula and that seemed to sort her out. They just did heel pricks on her fairly frequently to keep an eye on things.
DS (entirely unrelated to diabetes) was born at 31 weeks by EMCS. He went straight to NICU within minutes of birth - he was kind of waved at me in passing - and I didn't see him till he was over 24 hours old. For the first few days he was on TPN via long line (like a drip). TPN is an electrolyte mix thing that precedes any actual food, it stands for total parental nutrition and is meant to replace the umbilical cord/amniotic fluid. It's given when the stomach is too immature to handle digestion afaik.
I did find it harder to bond with DS than with DD, BUT I can't say that this was due to his being in NICU really, I think it was more to do with the stillbirths of his brothers and grieving, having to sort out a funeral, etc etc. It probably took most of the first year before I properly relaxed and bonded with him but now (he's 3 this week!) things are fine and lovely.
So things to think about:
There are ways of giving formula which don't involve bottles (syringe, cup) - you are free to insist on using one of those methods if it suits you wanting to BF.
What questions to ask if they start talking about a transfer to SCBU - who can advocate for you? (DH, birthing partner, sympathetic MW?).
Can you write a birth plan that outlines your choices for things like this - mine for DD included what I wanted to happen if she did need to go to SCBU (DH would go with her), if she needed formula (cup feeds only) etc. The MW on delivery read it and was chuffed to bits, she (bless her!) made sure the doctors followed orders and did what they were told :o eg with DH doing skin to skin in theatre while I was being stitched up.
I think the thing that helped me the most when both were born was that my ultimate goal wasn't to have any idealised kind of birth, it was just to end up with a healthy baby. To a large extent I didn't really care how that came about, and still don't. If you can get your head around that, then I think you'll be more relaxed and willing to roll with the punches.