What are the advantages and disadvantages of knitting sweaters by pieces and by loops?

Hello, sweaters have their own merits.

Generally speaking, the advantage of piece weaving is three-dimensional style, but the disadvantage is that it needs to be woven back and forth. The most troublesome thing is that all the parts need to be stitched after weaving. If the technology doesn't pass, it will affect the effect.

In circular knitting, it is generally to knit clothes with shoulder inserts and round shoulders up and down. The advantage is that you don't need to bother to calculate after calculating the starting needle. Just weave according to the figure, and the size can be adjusted flexibly. While omitting the sewing step. If there are shortcomings, I feel fine, but some styles will be more casual.