Regane contains 30-40% of PEA.
Nowadays I use both of them confidently, the only difference they make is the engine may not like too much UCL because Redline comes with UCL and certain gas already comes with it.
In the first few times I use Redline, it is either under or over dosage, and Toyota 1NZ-Fe seems very sensitive about this and the result is less satisfactorily.
Nowadays I only go for shock dosage with 15 ounces/20 gallon dosage and run it at least 2 tankful and the result is great.
Maybe the XOM gas in my area is not that good, I can feel the slight performance decrease after 5000 km,that will be restored by Regane/SI-1.