Perhaps you should give your decision just a bit more thought...
1. You can, of course, fresh-install the Windows OS onto your new larger Samsung SSD. It is true that many users prefer that approach rather than cloning the contents of their existing drive to a new drive. While there's nothing inherently wrong with that approach you understand, of course, that should you do so you will need to install all or virtually all of your programs/applications and other data to the new drive from the old one. This is not always as simple as it might sound. It can be an onerous process for a variety of reasons, not the least because you may not have the installation media to install those programs. I'm sure you understand that this is not a process whereby you can simply copy & paste the program data from the old to the new drive.
2. The crucial question for you to answer is are you satisfied with the operation of your system in that your current 120 GB Evo SSD boots & functions without any problems whatsoever? Assuming that we could magically transfer your entire current system over to your new Samsung SSD would that be satisfactory to you?
Well, since you've already answered the crucial question by indicating that your present system "runs lovely and smooth" without any problems it seems to me that you should seriously consider a disk-cloning operation. I see no negative implications in performing such and doing so will make your (computer) life much easier.
3. So if you want to try the disk-cloning route do the following...
(Before you begin ensure that the only drives that are connected in the system are the source & destination drives, i.e., your SSDs. Uninstall any other storage devices such as a flash drive, USB external HDD, etc.)
1. Boot to the 840 EVO 120 GB SSD.
2. Install the Samsung Data Migration program on the boot drive. The SDM program is a nice piece of work for cloning the contents of a disk to a Samsung SSD. As you will see the program is simple-to-use and straightforward in design. We've used it at least a dozen times with different systems and it has worked flawlessly. You should have little trouble in using that program as long as your source disk is completely functional without any problems of its own. Which, of course, is precisely what you've indicated.
3. Access the program and click Start.
4. The Source Disk and the Target Disk will be identified.
5. Click Start.
6. Click Yes when the confirmation message appears.
7. The disk-cloning process will begin. It can be a lengthy process depending upon the amount of data that's being cloned although in your case since only a relatively small amount of data will be cloned the process shouldn't take very long.
8. When the cloning process has successfully completed a message will appear to that effect.
9. Click Quit, then Shut Down.
10. After the system has been shut down disconnect the old SSD from the system. Connect the new 850 EVO to the motherboard's first SATA connector (designated either SATA0 or SATA1). It will probably be the same connector the old SSD utilized.
11. Before you transfer that old SSD to your son's machine, work with your new SSD system for a while to confirm everything works as it should.
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