Poppyjen I think probably a combination of both. She's very mild-mannered and sweet and optimistic, very pro natural birth etc, and I think it never occurred to her that MWs on a homebirth team would have so little respect for my wishes and would interfere so much with an otherwise perfect natural birth. There were no problems and no hint of problems, but the MW panicked when she realised she was on her own with a student, and the hours she thought she had ahead of her to sort things out was more like 10-15mins, and the second MW wasn't answering her phone.
But I think that was compounded by her being a trainee and not having been the doula for many births (I was her second or third on her own, I think). Last time I saw her she said she often reflects on how it went and would do everything she could now to stop MWs doing that again. So although it wasn't great for me, hopefully it's helped the women she's been with since.
Also she really wanted to have a good relationship with the MWs and not antagonise them. She now feels that that's not her problem and getting women a good birth experience is more important.
So I think either a qualified and experienced doula would be preferable, or alternatively a trainee who is prepared to be really assertive and fight for what you want, someone who is at least ready for the possibility that they might have to.
Hardcheese - we had a hypnobirth and want to do it again. That's the only regret I have about not having a doula this time - DH was completely free to be with me and help me focus and get through it. It was really wonderful for the two of us. The doula dealt with all the phoning the hospital/arguing with the hospital and we didn't have to worry about any of it. The rest of the time she just faded away except if we needed her for something.
She was the one though that convinced the hospital I was in labour ("she wouldn't be able to talk to us on the phone if she was", I was in transition) and likewise persuaded the MW to actually bring the equipment into the house. Although they pretty much ignored her after that. She managed to get back in control though, and was able to stop them doing things to DC after birth while I was basically in shock (had a very hard and fast labour), like cutting the cord straight away and cleaning off the vernix. Also stopped them administering Vit K injection to DC and the 3rd stage injection to me, I wanted a physiological 3rd stage. So was really helpful then. And when I still too shocked to be able to hold the baby and do skin-to-skin she set up DH and the baby for skin-to-skin together, so at least one of us did it.
Just explain to potential doulas that you don't want them to get in the way, what you do want, and see who can accept that.
I still think the birth would have gone even less the way we wanted if I hadn't had a doula.