Which one is the best Windows OS for Laptop?

I am so confused about which Windows version to install on my new Dell Latitude D620 Laptop. The question that i'm asking is that, which one is better from these versions of Windows:
1) Windows 7
2) Windows 8/Windows 8.1

I've heard from many places that Windows 8/8.1 is more touch screen specific and not quite suitable for laptops/PCs.
I am currently using Windows XP SP3 as it came pre-installed on my new laptop machine. Since Win XP is retiring after next 2 months as announced by Microsoft, I would like to make an upgrade to the latest Windows release. So which one is best Windows operating system version from the choices written above. Please answer it. Thanks in Advance!

If you own a Win7 license which you want to try on the PC, then you can shrink C to try Win7 alongside Win8 to compare.

Once you shrink C in Disk Mgmt, enter BIOS setup to disable Secure Boot, enable Legacy BIOS or CSM, boot the Win7 disk to Clean Install Windows 7.

I've tried this on many PC's and always end up using Win7 which is a better OS unless you have touchscreen.

Let us know how this goes.

OK, so how much disk space should I allocate for shrinking for Windows 8.1 partition?

And after all, Windows 8.1 is made for touch screen devices only. So I would go for Windows 7 unless I use a touch panel or something like that on my computer. Am I right?

So if you could conclude this discussion/debate, then is Windows 7 the recommended OS according to the specs of my Dell machine? You can check the specs by clicking on "My System Specs" at the bottom left side of this post.