The best algo to mine varies on a day to day (hour to hour) basis.
It seems that the best way to go is to use an auto switch/profit maximising miner - I use Nemosminer and it seems to work well
on zpool.

First time you start it it will benchmark all the algos on your rig then work out in real time the most profitable one to mine.

You may be able to tweak profitability a bit more by using the nvidia-smi utility to adjust power limit on your cards
you are aiming for max hash/watt rather than max hash overall (assuming you pay something for electricity)

I run 1070 cards and have found that a power limit of about 170 watts/card is best but I think it depends on the exact card you have
the default is a power limit of about 200 watts/card (depending on the card bios) and after a fair bit of benchmarking I found
lowering the power limit a bit got more hash/watt for a few % better overall return at the expense of a slightly smaller daily income.