[Mike Rivers]

J wrote:

Which is a better choice for live recording in concerts

It depends on how you're going to be recording those concerts. Perhaps
none of them.

taking notes

The cheapest one

etc.

The one that's left.

YOU need to study this out further, looking at the features, user
interface, input connectors, performance of built-in mics, type of
flash memory card used, and narrow down just what you really want to do
most of the time, and how much of a bother you'll put up with when
doing something else.

For example, will you only be using built-in mics or will you be using
external mics? Would you use external mics if the built-in mics don't
sound good enough? Do you have mics or do you have to add this to your
cost? (I assume that's a concern since you pointed out which one was
cheapest)

When you have your requirements narrowed down (and "which one sounds
the best?" doesn't count) ask more detailed questions and you might get
some better guidance.

Or you coudl just buy the Edirol because it seems that there are fewer
things to dislike by most people. There aren't enough of the Zoom HR4
recorders around in this community for there to have been a very
comprehensive review. That one is most attractive to me because it has
XLR mc connectors and phantom power (I'd frequently use external mics)
but that doesn't matter if the preamps are noisy, gain control isn't
effective, or the sound just isn't very good. Maybe it's OK. I don't
know yet.