Reasons why its better than Letv 1s:
Faster processor
Antutu score( 80000) while on le 1s( 55000)
Better camera quality 16mp than 1s 13mp
No heating issues
MiUi is more updated and feature packed than the new eUi
Supports an Sd card
Display is more crisp with more vibrant colors( pointed out by many experts)
Way more established brand and more customer care