There are an equivalent number of advantages and drawbacks, and -essentially- all depends on what you are reading: get() leaves the delimiter in the queue thus letting you able to consider it as part of the next input. getline() discards it, so the next input will be just after it.

If you are talking about the newline character from a console input,it makes perfectly sense to discard it, but if we consider an input from a file, you can use as "delimiter" the beginning of the next field.

What is "good" or "safe" to do, depends on what you are doing...