Yes, with regards to performance, Nvidia GeForce GTX 1660 Ti outperforms, GeForce GTX 1060 5GB by 63.1% in 3Dmark benchmark.
The GTX 1660 Ti is more energy-efficient considering its performance, having power consumption of 120 watts and a 3DMark score of 6373. By comparing its benchmark score to its power consumption, we get an efficiency score of 53. GTX 1060 5GB's efficiency score is 33 .So GTX 1660 Ti leads by 60.6%, making it the smarter choice in terms of power consumption.
GTX 1660 Ti price to performance rating is lower than GTX 1060 5GB's. GTX 1060 5GB offers 0.0% better value fo money.