What is the 1070 TI equivalent to?

The 1070 Ti is mostly used to mine Zcoin, Beam, Grin, Ravencoin, and Aeternity . More conservative miners prefer Ethereum and Ethereum Classic.

The direct modern replacement for the 1070ti would be the RTX2060/2060 Super . For a significant boost in output performance/GPU compute you could move up to the 2070, 2070 Super, 3070, 2080, 2080 Super, 2080ti, or 3080 so long as your power supply and output resolution are sufficient.

The 1070 Ti is basically the 1070 with 25% more working CUDA cores (2432 versus 1920) and slightly higher base clock of 1607MHz (versus 1506MHz in the 1070). This translates to the 1070 Ti being nearly as powerful as the GTX 1080 which has 2560 CUDA cores, 8 GB of GDRR5X memory and boost clock of 1733 GHz.