Rushed launch game versus late life release. What you should actually be comparing is launch window titles to each other.Not exact 1-to-1 comparison but it should give us some idea the difference, on a demanding game (DQH 2) on both platform
https://www.youtube.com/watch?v=ljdJJLU-AfQ
Closer to 14x in pure Gflops I believe (14 vs 192).A portable Switch in the low clocked GPU mode is still something like 10x more powerful than the Vita. That's not even including gains on GPU efficiency.