I'd put it this way. AmigaOne without OS4 is practically useless. And judging by late silence from Amiga, plus Hyperion folks can't even give an estimate when it will be ready, it doesn't look too good. I have bet money (5€) that this will happen in 3/4 of 2003.
Also there are _rumours_ of A1 board being somewhat crippled and a hack. if this is true, your guess is just as good as mine.
Meanwhile there are hundreds of Pegasos' floating around used by developers. And some of them I'd call "Keypeople of community". Those developers won't necessarily never do any good for A1/OS4.
Also, while waiting for OS4 to arrive, MOS gets better and more polished every day.
OS4 looks good on paper, MOS looks good now.
AmigaOne doesn't look good on paper, Pegasos2 does. And those two items are likely to arrive just about the same time (3rd quarter 2003 as I quessed ;-)
WHEN Peg2 and A1/OS4 arrives, there's (hopefully) quite nice set of software available for MOS, when developing for A1 only *begins*.
Looking at the situation from this point of view, it's obvious who leaves the ring undefeated.
My point of view only, fuel up the flamethrowers.