This is definitely a personal choice that is going to depend on your circumstances as a couple.
I just had my first baby here in the UK three weeks ago. Yes, the maternity leave compared to the US is fantastic. My company offers six months paid leave... I almost fell off my chair when I found out that I am getting paid to stay home with my baby for six months. BUT - this is not normal. In my antenatal classes, me and one other mother have paid leave. The other five moms are getting statuatory pay which is about £550 a month for 9 months. Needless to say this is still way better than what you would get in the US.
If I worked for my current employer in the US, I would have a company provided insurance policy. The birth would have cost a small co-pay for the initial visit and a co-pay for the hospital stay. According to the Intranet at work, this would have set me back $130. While I didn't have to pay at the point of service for the NHS, I actually spent a lot more than this on parking. Seriously, I spent hundreds on parking at the hospital but I had complications and had to go in every-other-day during the last couple of months. Most people wouldn't have that expense.
As for the care I received, I feel as though I had excellent quality of care, especially from the midwives (both community and on the wards). But I did NOT feel as though I had good continuity of care. As I said, I was heavily monitored in my third trimester and was a regular at the hospital. I always saw a doctor... but it was never the same doctor twice (actually there were two that I saw twice but several weeks between the visits and so much had changed that there was no continuity in the vistits). I do wonder if things would have turned out better if I had a single consultant overseeing my care.
Another huge factor is your support network. Maternity leave can be a very lonely time if you don't have an existing support network. If you don't have a lot of support, are you willing to put in a lot of effort to build one?
Schools are subjective. I don't agree with everything I know about the UK school system. But I know the US school system isn't perfect either.
The cost of university here is FAR greater than my in-state public university degrees. A 3-year Bachelor's in the UK is currently £27,000 ($45k). Current rate for my university (a top state school) is $25,000 for a 4 year degree, so $20k cheaper.