Yes, with regards to performance, Nvidia GeForce RTX 2080 outperforms, GeForce GTX 1070 Ti by 62.1%.
The RTX 2080 is more energy-efficient considering its peformance, consuming 250 watts to produce 3DMark score of 11093. By comparing its benchmark score to its power consumption, we get an efficiency score of 44.4. GTX 1070 Ti's efficiency score is 38.0, 16.7% lower, making RTX 2080 the smarter choice in terms of power consumption.
When considering value for money, RTX 2080 offers a better deal than, GeForce GTX 1070 Ti by 118.2%. Here is more in depth overview of the price and used prices of RTX 2080 Price History and GTX 1070 Ti Price History