... but if it was your money, which would you choose? And why?
You must be familiar with the design of the unit by now, but I just can't stomach it to be honest. I much prefer Sony's design for reasons too boring to get into here, but I must mention the Sony has a recording dial and far more logical design to me. Sony's designers take usability (and I suspect, materials) much more seriously.
Quite apart from any technical aspects (battery life, sound, etc) I'd just have a hard time paying the same money for the Edirol. (I own 2 Roland products though, so please understand I don't hate the company).
There are a few features the Edirol has the Sony hasn't, but so has the Sony, and I don't regard them as being too different, feature-wise.
I expect Roland / Edirol to drop their price in coming weeks/ months as the PCM-M10 takes a hold of the market and the word of its goodness spread. I think Sony are doing an incredible job with this model and (barring any great show-stoppers) they will do extremely well against the competition here.
As the price of the Edirol drops (again, only my prediction), it may be the better choice, but only then IMO. I see a big value disparity between this unit and the Sony currently selling at the same price.