Hey, that is a good question. It really depends on how you would use the internet personally.
If you enjoy watching videos, spend a lot of time on Youtube, we would recommend you to choose a plan with a bigger data allowance. If you are using mostly for browsing things and checking your email, not downloading a lot of images and videos, you may go with a smaller data allowance.
Remember, you can always adjust your plan next month based on how much data you used previously.
To give you an idea about how much data you would use for an estimate, you can check the table below:
|An email with only texts
|Viewing a webpage
|Downloading an app or a game
|Listening to a 3 minutes song
|Watching a 5 minutes video (i.e, on Youtube)
|An hour of streaming medium quality movie