As measured from each coin's respective launch to the open market, HEX has generally outperformed ETH in terms of ROI. Over the course of the nearly 2 years that HEX has been in existence, it currently sits at an ROI of 10,000x as measured from all time low to all time high.
The first chart compares the normalized ROI as measured from launch to the open market for both HEX and ETH.
The second chart, titled "HEX/ETH Performance Index", maps Ethereum's historical performance to a line so we can more clearly see HEX's performance relative to ETH by reducing one degree of noise.
Long term HEX investors can monitor the daily changes of ROI as compared to ETH in an analogous "time since launch" framework. Historically we've seen that on similar timeframes HEX has, more often than not, kept track with or overperformed Ether.
Gerardo - @gerawrdog