Nio doesn't offer any cutting edge tech. It's don't outrange any rival, autonomous level is not as good as P7.
Xpeng P7 is currently the best EV in China or best EV in the world. Range is long. Top quality sound system and sound proof is good. Control wise more leaning towards comfort driving. Voice control and autonomous parking are world class. Interior space are spacious than Tesla 3. While price wise is almost similar.
Xpeng sound system maybe functionally good but design is odd - the dash seems to cover the area of speakers in the side.