Pipa is the most difficult instrument to practice in folk music. Generally, you can play music without practicing music for a month or two. Guzheng, as long as you master the basic fingering, you can practice some elementary tunes. But at the advanced level, the difficulty of all instruments is the same.
Moreover, compared with guzheng, pipa is more difficult to learn by itself. But now there are too many guzheng learners, and pipa is still a minority, which is good for cultivating classical temperament.
Which one to learn depends entirely on personal preference. I hope you can listen to their opinions more. Pipa's pipa language is contrary to the perfect mountains and rivers of Guzheng. Thank you.