I guess there is a 4th method to add to the other three, which is what is sometimes referred to as a cosmetic vagina.
I know this won't be popular and will be dismissed out of hand as not truly female but, as with the other three, there are some pros and cons.
The pros:
Less complicated both during and post surgery
No dilation
Still sensate
Visually identical from the outside
The Cons:
Not a 'real' vagina as such (debate)
Penetrative vaginal sex impossible
I am slightly stuck in a mental block on this at the moment but I really don't want to cause any offence. Let me share my feeling at this moment, but please bear with me. It's this. For some reason I can't get over the idea in my head that a penile inversion vagina is a pouch. It's closed with, for example, no cervical opening to the womb. It needs daily regular dilation and isn't self-lubricating. It's basically inverted skin and therefore a closed system. Someone even once said to me she could have unprotected sex because HIV couldn't transmit through it as her vagina is essentially skin. That's NOT something I would recommend for a single second by the way. Just what she said.
For this reason I can really get the sigmoid colon vagina. You have it and, almost, forget about it. It's self-lubricating and (I understand?) doesn't need constant dilation.
I guess I'm wrestling with this as I'm returning to my true self and, some day, I will want to have the surgery. I'm lesbian and so penetrative sex isn't something on my mind. I'm quite tempted by the idea of a cosmetic vagina or sigmoid colon, but the latter is pretty invasive.
Just ruminations. Please forgive if any of this feels tactless. I'm searching for answers xxx