which Nvidia 3060ti and 3070ti are best for mining RVN

Hi all.

I am planning to buy a couple of Nvidia cards for miming RVN, and I am leaning toward the 3060ti and 3070ti, but I am not sure which manufacturer is best for me in terms of overheating and OC settings and stability? And if other Nvidia options are good for my current rig setup, I also wonder if mixing my current 5 NVidias Zotac 1060 6GB cards with them is a good idea or not.

Thanks in advance for any input.