UC = unassisted childbirth.
I do understand the risks. I also know that my local hospital does not have a gleaming reputation as far as monitoring women in labour/delivery. I was admitted in transition with my son, but his heartrate wasn't checked for over 20 minutes after arrival, because they were busy. Once they realised I was actually bearing down and fully dilated, they left me again for 5 minutes to prep for the birth because they hadn't realised that I was so far in. Once they stayed with me, it all progressed smoothly, but that delay was horrible and painful, for me and potentially distressing for my boy, coz he was ready to come and I was working against the urge to push.
With a homebirth, they just don't leave you. Once they arrive, they stay with you until either the baby's born and settled, or the transfer to hospital is complete. You also get more intensive postnatal care, to guard against the risk of puerperal infection. I wouldn't dream of having a homebirth for a first baby, or if my first labour/birth had been complicated.
In fact, I was very opposed to homebirths until after I had my son. The major risk I personally have with this pending second delivery is that if I have not planned for a homebirth, I could have him literally anywhere. My established first stage with my son was only 2 and a half hours. If (and it's a big if, I know) I follow the general rule that subsequent labours are half the time of the first, I'm looking at a bare 75 minutes from 0-10 and then a much shorter 2nd stage. Despite being booked for a homebirth, I've been told to ring an ambulance if I go from not-much to pushing very quickly. The midwives know they can't guarantee to be with me quick enough to deliver the baby if it's very rapid, and they don't want me to deliver anywhere unsuitable either.
I am rambling!