This is where my interests are: recording acoustic guitar and small string bands. In my search (and to indulge my gadget habit) I have owned the R-09, RH-1 and the H-4. As well as a number of Sharp MDs and a Microtrac. The H-4 is a neat, multiple use portable gadget. Here is a snap-and-shoot recording I made with the internal mics on the H-4:
http://dharmastrum.net/89GibsonJ100.html
The R-09 is a great point-and-shoot recorder which fits nicely into an instrument case, but regarding internal mics, I found that I preferred the results from the H-4. (Using external battery pack - there are some issues with "noise" using only internal batteries).
At the moment, I am quite enamored of the RH-1/M200. I decided to give minidisc another try when I heard about improvements made by Sony on this model and the Sonicstage software.
So, between your two options (R-09, RH-1), I would say if you want super convenience and pretty decent sound with internal mics, go for the R-09. If you are willing to use external mics, I would suggest the RH-1. There may be technical reasons (quieter mic pre-amps, for example) but I just like the sound of the home recordings produced by the Hi-MD unit. I have been using AT-822 and SP-TFB-2 microphones.