Hi Helman,
The LG Neon R panels are around 25% more expensive than the Neon 2 panels due to the different type of cells used. The Neon R panels use IBC cells which have the highest efficiency and longest life. See more about IBC cells explained in detail at the end of this article.
The LG Neon 2 are also a very high performance panel, but not quite at the same level of the Neon R.
Jason