I own the AR6's in 181 and I skied on the El Reys in 178 for 2 days.
The El Reys feel lighter and more nimble than the AR6 due to cap construction and do carve pretty tight, but I can definitely say that they feel less bombproof and less solid than the AR6s.
The El Reys feel exactly what they are meant for: an all-mountain ski that carves and feels like a regular carving ski, but still very light and very poppy for jumps. It reminded me of the Foils, very similar feel.
I just prefer the the more confidence-feel of the sandwich construction of the AR6.
Just my two pennies...