Difficulty Retarge, block time, and PoW Block Reward will always be the same regardless of the type of algorithm I will choose when mining begins. Or are there variations between them?
Block reward is the same for any algo u choose to mine on ur desired algo
I asked the question why Blake2s seems to be the most suitable algorithm for mining with NVIDIA. I have 2 GTX1060 cards. So would that be?
Yes, Blake2s should be your choice. X11, X13 and SHA256 are for ASICs.
I am not sure about X12 - never used it before. It seems that people were using GPUs to mine with this algo. But I can't find a pool with any hashrate on this algo now.