A 120Gb SSD will be able to store fewer files than a 1Tb HDD, but the SSD will operate a lot faster than the HDD. Nowadays, SSDs are taking the place of HDDs because of their performance and reliability.
Solid-state drives come in different forms and shapes, but they all share a common feature which is, none of them have any moving physical parts. But hard disk drives have moving parts and sometimes they can be problematic.

Specific Differences | 120Gb SSD vs 1Tb HDD
These days less than 120Gb SSD and 1Tb HDD are hard to find. Even though SSDs are taking over the market of storage, HDDs are still widely available. In the case of price, HDD is the less expensive option than SSD.
120Gb SSD vs 1Tb HDD For Gaming
If you are a casual gamer and do not use your PC a lot, then a 120 Gb SSD will be enough for you. But if you are a professional gamer and play a lot of games, then you will need a lot more than 120Gb. So, you can go for a 1Tb HDD. But if your main concern is the game loading time rather than storage, you should get an SSD.
120Gb SSD vs 1Tb HDD For Office
For office work like typing or making spreadsheets, you do not need 1Tb storage. As a result, a 120Gb SSD will do the job pretty well for you. Besides, it will make your PC boot faster.
120Gb SSD vs 1Tb HDD For Designers
Designers who work on Photoshop, Illustrator, or make 3D objects, need a lot more than 120Gb. And the software and applications can run on HDD pretty well and do not show any major difference in loading time. As a result, it can be said that for graphic designers, 1Tb HDD is suitable.
Uses of 120Gb SSD
A 120Gb SSD can be used in school computer labs, offices, and any lightweight works. Beginner programmers, little kids, mostly internet-based workers can also use a PC with 120 Gb SSD.
Uses of 1Tb HDD
A 1Tb SSD is for those who keep their files stored and need a huge amount of storage. Movie production PC, database centers, and pretty much all the large companies have PCs with this kind of storage.
Durability: 120Gb SSD or 1Tb HDD
SSDs are more durable than HDDs. Here a 120Gb SSD can last around 9 to 15 years, where most HDD users report that their HDDs crash after 2 to 6 years of usage. SSDs last longer because of their fully electronic system. On the other hand, HDDs have their disadvantages mainly because of their mechanical moving parts.
Disadvantages of 120Gb SSD
A 120Gb SSD is capable of fast data transfer. But the only drawback is the too-small storage at a higher price. You will have to manage your storage most of the time, like deleting and shrinking files.
Disadvantages of 1Tb HDD
A 1Tb HDD has 8 times more storage than a 120Gb SSD, but it is slow. HDDs will load files slower no matter how large the storage is than SSDs as they catch signals physically by their moving parts. Again, usually, an HDD does not last more than 5 years.
A PC with a 120Gb SSD and a 1Tb HDD
To keep a balance between budget and storage, most PC users use a smaller SSD and a larger HDD. Mainly you can install the operating system on your SSD for a smooth overall experience. You can also store your heavy stuff on the SSDs, like games that take time to load.
You can also save the important files on your SSDs that you can not collect from the internet. And on the hard disk, you can save your regular files like movies, songs, books, etc.
How much SSD do I need for Windows 10?
Windows 10 needs at least 16Gb of your storage to operate. You should free up at least 25Gb to run windows smoothly as it will have software updates and driver updates.
Conclusion
A 120Gb SSD is always better than a 1Tb HDD if you are not concerned about storage. You should keep your SSDs and HDDs 20% empty to operate smoothly. Again, installed programs on the SSD will function quicker.
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