I see a desktop Amiga (AmigaOne or Classic Amiga) serving a different role than a laptop Amiga (or laptop pc running Amithlon). IMHO, the desktop/tower system would usually be a more permanent setup with various peripheral devices (printer, scanner, speakers, etc.) attached to it. The laptop gives you the freedom to move around and setup quickly. Generally you would not have the other stuff with you.
Normally I'd agree with the both of you, but if you use a laptop with a docking station you can have a permanent setup with various peripheral devices (Even a big 21" flatscreen if you want) and use the same desktop on the way..
Why I brought this up is the idea that these laptops are going to outperform the AmigaONE/Pegasos... With all the bitching about speed isses lately, well you know..
In my mind, a desktop Computer should outperform a laptop, if there from the same timeframe.. (I'm a sick minded guy, ok ? :-P )