Final answer:
The best buy for communicating in a coffee shop is a smartphone, while a laptop is the best choice for communication within the school. Trade-offs to consider include size of the device vs. features.
Step-by-step explanation:
In light of your budget, the best buy for communicating with your fellow student in a coffee shop would be a smartphone. Smartphones are portable, affordable, and come with a variety of features that allow for easy communication such as messaging apps, calling, and video chatting.
For communicating with your fellow student located at your school, the best device choice would be a laptop. Laptops offer a larger screen and keyboard, making it easier to type and communicate for longer periods.
When considering trade-offs, one important factor to consider is the size of the device vs. features. Smaller devices like smartphones are more portable, but may have limitations in terms of screen size and keyboard usability. Larger devices like laptops offer more features and a better user experience, but may be less portable.