Hi Steve,
do I understand you correctly? The 3070 version is even slightly cheaper? Sounds a bit weird :D
Regarding performance you could take a look
here and
here for an overview about all tests of 3060 and 3070 devices. Just pick two reviews with similar TDPs on each model.
I would the 3070 estimate to be around 10-15 % faster in 1080p and maybe slightly more in 1440p thanks to the bigger VRAM.
If prices and rest of specs are around the same, I would of course go for the 3070, but for 1080p gaming the 3060 is much more than enough.
P.S. Ah, I think "i" on the 3060 model stands for Intel and the 3070 model comes with AMD right?