I would prefer to give birth in the hospital pool for the fact that help is there if something should go wrong.. but on the other hand if i did a home water birth at least there will be a pool deffo available!
As one of the other ladies has already explained, you are not on your own at home. You will have 1 midwife with you at all times, and 2 as soon as you're in established labour. This is more supervision than you're likely to have in hospital. My friend was telling me her birth story the other day and I couldn't believe it. They left her in a side room alone after inducing her at 10pm, sent her husband home as visiting was over. They didn't check her at all that night, she staggered out to the desk once where they gave her 2 paracetamol, they finally took her down to the delivery suite at 6am the next morning, still without checking her because she staggered to the desk again and said she was bleeding, when they did actually check her an hour and a half later, she was 9cm dilated. I was totally horrified that she'd basically laboured alone, and completely put off a hospital birth. From all the birth stories I've read on here, you definitely get better monitoring and more attention with a home birth than you do in hospital. You have 1 and later 2 midwives all to yourself, not attending to a ward full of labouring women.
It's also not the case that they just bring a stick for you to chew on! They come with resus equipment, gas and air, monitors for the baby's heart rate, you can have diamorphine prescribed for you in advance if you want, and they can administer that, they have kits to perform epiostomies and to stitch up afterwards. They can do everything they would do in hospital, except perform a c-section or administer an epidural, but these would be done by consultants if you were in hospital, not by the midwifes. And if something happened to you in hospital there is still a time delay whilst theatre is prepared for c-section/emergency operations and the surgeon prepared, usually around 20-30 minutes from what I've read. The same preparation can be happening in hospital whilst you're travelling there from your home, if you have to transfer. Your midwife will alert them and then transfer with you.
I'm not saying in any way you shouldn't choose a hospital birth if that makes you comfortable, that is your choice. But you shouldn't automatically assume you'll be "safer" in hospital, or that things will inevitably end badly if something goes wrong at home. From what I've read, it's rare that anything goes wrong suddenly and dramatically with childbirth, whether you're at home or in hospital. The exception is something like a uterine tear from a previous section scar, but again that is rare, the risk is something like 0.5%, and even then it is said there are signs of things beginning to go wrong. But generally the midwives can see if there are problems emerging and prepare for any interventions with plenty of time, whether you're at home or in hospital.
So the statement of "help being at hand in hospital" whilst not inaccurate, does not exclude the fact that there is equally help at hand if you're at home, and some would argue that the help you have at home is better because it's 1:1 care.
I would spend plenty of time reading up on your options and making your choices well in advance so whatever you choose it is with accurate knowledge and not just assumption. I've only been reading up on home births for the past 4 or 5 weeks. Prior to that I made the same, seemingly logical assumptions, that you would get more care in hospital. But everything I'm reading and researching is teaching me this is not true.
i hope it goes well for you! 
of course you're absolutely right - at least by opting for a home waterbirth I have the chance it could go well. And if I have to get out and do it the same way I have previous labours then I wouldn't mind too much.
