M.,
With my 5 year old, I used cloth diapers (Dy-Dee Diaper Service our of Pasadena- you can google them) and with my 1 year old I am using disposables (trying to use gel-free or chlorine-free though I haven't been as consistent).
So, the cloth diapers are a little annoying because you have to carry them around (even the soiled ones) and you can't just dump them in the trash. Also, they take a while to learn how to properly fold and place so that there isn't an eruption each time your child goes. They are bulky which is funny on a newborn. The diaper service delivers and it's great that you can use those cloths as a protective layer when changing your baby or to clean spit and stuff. In terms of money, you are saving a lot!
The disposables are more convenient- BUT, I don't like that some of the brands (most brands except for Tushies) have gels in them to absorb the pee. It's not healthy for my boys' family jewels to be around all that gunk. Also, it's hard to tell sometimes if he's actually wet- like I've got to get my face into the diaper so I suspect that he sits around without being changed as often as my first-born was.
I chose not to use the cloth ones with my second one out of convenience really. Still, I used the Tushies delivery system for a while (then my child outgrew the sizes. Once potty training begins, though, I am going back to Dy-Dee Diaper so that we can have an easier (and hopefully faster) time with training. There is a new diaper on the market- gDiapers and they are flushable. I don't know about standing over the toilet and swiveling waste, but you may want to look into it. I do feel guilty about some of the disposables I've used. I just know they are going to sit in a land fill forever and I feel bad about leaving that as an inheritance to my children.
Congratulations on No. 4 and best of luck!
Take Care,
F.