Weird that it would be $400 less when any XP laptop should only cost that much to begin with... and the retail difference between Home and Pro, when they were supported products, was only $99 or so...
I would be more concerned that the specs of any laptop being sold with XP on it are not up to snuff for running current versions of ArchiCAD.
If you mean Windows 7 Home and 7 Pro, go ahead and buy Home, as the upgrade to Pro (if needed) is an online key/download thing and also around $100. With Win 7, if the XP was a typo, there is a big difference with Pro in that it allows you to run programs in 'XP Mode", which would allow you to continue to run old versions of AC and perhaps other stuff that you've collected over the years.
Anyway... the main thing that XP Pro does is support better networking and more secure resource sharing, with automatic reconnection, etc. If your machine doesn't access network shares constantly and/or you do not have a need to share folders with some but not all users (e.g.), then Home is probably fine.
All of the above to the best of my memory, anyway...
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB