I had DD in February at St Thomas's and overall I'd say it was a good experience. The sonography department was taking place in a research project while I was there, so instead of the usual scan at 12 weeks they were much more detailed and thorough.
I was induced at 42+2, started on the birthing unit which is really nice - it's a private room and they have birthing pools and a conservatory that you can walk around in early labour. The midwives in the birthing unit tend not to intervene too much in early labour unless you need it. Had access to gas & air, paracetamol and pethidine.
My waters broke but 7 hours later I was still only 3cm, so I was transferred from the birthing unit to the labour ward, which is on the same floor, so a very quick transfer. Still in a private room, had drip and epidural and continuous monitoring; I'd hoped for a low-intervention vaginal birth but as labour progressed it looked like an instrumental or section was more likely. I was explicit that I didn't consent to an instrumental and thankfully they agreed to a section. Transfer into theatre was also very quick, and the EMCS was actually a relatively calm experience.
On the negative side, the recovery ward and postnatal ward is shared. Six beds to a ward, partners can stay overnight in a reclining chair at your bedside. I was lucky, the other patients on the ward weren't too loud and everyone was fairly respectful of your privacy, but that's not everyone's experience. Staff were on the whole kind and helpful. Food was pretty average hospital fare, but there's an M&S so you can get snacks if you need them. We were discharged 48 hours later.
What made the biggest difference to my pregnancy and labour was that my community midwife team worked on a caseload basis, so I saw the same midwife and student midwife throughout my pregnancy, and they were able to attend the latter part of my labour. I'd suggest finding out what's available in terms of midwife care from your GP - will you see the same person, or will it be a different midwife each time, and will your midwife be able to attend your labour? It may be the case that your midwife is able to attend if you're at one of the hospitals, but not the other. Hope this helps!