Hi Tutter - welcome to the area! I live in Wallingford, and gave birth at the JR in Oxford, although it was supposed to be Wallingford. I found both to be excellent. Unfortunately, my dd's birth wasn't textbook - I had an extremely long second stage and although the midwives at Wallingford were great, and really tried all the tricks in the book to help me have the birth I wanted, I had to be transferred up to the JR for a drip and quite possibly a caesarian (although I didn't in the end need that). If you are having a low-risk pregnancy then I would definitely recommend Wallingford. If you need to be transferred in labour, that is smooth and easy - I certainly didn't find it at all traumatic. Like all the cottage hospitals in Oxfordshire, Wallingford is under review, and the proposal is that the maternity unit may be moved to Didcot. However, this is not going to happen in the next 9 months - it's been rumbling on for years! Wallingford is small - only 4 beds, so there is a tiny risk that they will be full and you'll have to go to Oxford anyway, but that risk is tiny, and I have never heard of it happening. The smallness is very much what makes the unit appealing - the team of midwives are great and you will see the same people again and again, and even overnight there is never less than 1 member of staff for 4 women (plus the midwives specifically for a woman in labour)- great if you need extra support, as I did. Even if you deliver at the JR, you can be transferred back to Wallingford before you go home, as long as they have space (priority for the beds is given to women in labour coming in to give birth) - that is fantastic.
Having said that, the JR was good too. The delivery team were great - even though I was going in for intervention, they went through my birth plan and tried to do as much as they could as I had asked, and where they couldn't, they explained why and explained what they wanted to do instead, and why, and let me give the OK. When I wasn't sure about something, they gave me time to think about it and chat with my dh, and in the end I said yes, but it felt like my decision. I had a PPH after the birth, and was sent to the Observation ward, which was also excellent. I have to say though, that once I got up to the general postnatal ward, it was ok, but not a patch on Wallingford, where I went next (yes, I spent nearly a week in hospital, so I had a fair bite of all the pies! ). The staff were very well-meaning, but there are many more mothers per member of staff, so the one-on-one time is much reduced. I suspect you'll find exactly the same at the Royal Berks though.
The best thing for you to do would probably be to visit all three places - you can go into Wallingford any time, by appointment, I think and the JR has tours every Monday and Thursday evening - I don't know about the Royal Berks, but I'm sure someone else can help. I would say though, that even if you go for Wallingford, please look at the JR too, just so that if the worst happens and you go there instead, you know where everything is and what to expect - it made all the difference to me.
Most of all - enjoy your pregnancy!