What's the difference between iphone6sp and iphone7sp? Is there a big difference in fluency and so on?

Of course there is a difference. The main differences are: 6s has the maximum brightness (standard) of 500cd/m2, full sRGB standard, supports wide-angle dual-domain pixels, and the front is coated with anti-oil and anti-fingerprint coating, which supports simultaneous display, enlarged display and convenient access display of multiple languages and characters. 2.5D Glass 7 is 1400: 1 contrast (standard) and wide color gamut display (P3). 6s is dual-core 7 is quad-core 6s is Apple A9+M9 coprocessor 7 is Apple A/KOOC-0/0+M/KOOC-0/0 coprocessor Battery capacity 6s is/KOOC-0/7/KOOC-0/5 MAH7 is/KOOC-0/960mAH6s is dual camera with rear camera/KOOC-0/20. Single pixel size 1.22 micron, five-mirror lens 7 is double camera (front and rear), rear camera120,000, front camera 7 million, six-mirror lens 6s is iSight camera, and infrared filter is mixed. Sapphire crystal lens surface 7 is a front-facing facetime camera, which can achieve up to 5 times digital zoom video shooting: slow-motion video, 1080p (120 fps) and 720p (240 fps) time-lapse photography video (anti-shake function is supported), and cinema-level video anti-shake function (1080p and 720p).