Desk vs Laptop

[Pay Wahun]

I am confused in this days of pc architecture. What is the best pc to
make a long term use of open source? I have been using a HP lap for
three years and seems that my original windows setup disk is the only
means to make effective use of this pavilion. I have been switching
hard drives for ubuntu and windows  but now wants to stay with open
source. Just found that my original windows setup disk is the only way
for optimum use as per HP teach. Iam however confused whether to buy a
new laptop or desktop. Any advice? The confusion is that even desktop
architecture gone and wis going through many changes today - what's
the best bet forward with an uncertain economic future?