What are the display assembly differences
What's the difference between iPhone 6s LCD Screen and Digitizer Full Assembly - Choice and iPhone 6s LCD Screen and Digitizer Full Assembly?
苹果官方于2015年9月25日正式发售iPhone6S A1688/A1633机型。 此机型的修理方式与先前几代差不多, 需要螺丝起子及撬棍工具。 同时也适用GSM or CDMA/16, 64 or 123 GB/ 银色, 金色, 深空灰色, 玫瑰金色等机型。
It's a quality difference. The lower cost one is built with aftermarket parts (Tianma LCD, thinner flexes, not CPG assembled?) while the expensive one is built with OEM/Original parts and likely CPG assembled. This can be a very murky distinction that I don't want to speculate on. Matt (@cvneutron) from iFixit can certainly give you more details.
Looks like one comes with the tools you need as well as some of the parts that transfer over. If you lack the tools required for the repair then go for the tools. The parts that transfer over should be no big deal to transfer. Keep your screws organized and go slow. Good luck!