I have a 75 gallon mixed reef display and two nano tanks (4 gallon frag and 3 gallon macro algae). I would prefer not to dose and rely on the salt mix and water changes for the nutrients my tanks need. Any thoughts on salts that meet that criteria?
All of them, and none of them.
If your elemental demand is low (you're relatively lightly stocked on corals, especially stony corals), then just about any salt will do what you need. If you're above that level, then your corals will use up what is available in your tank before you do a water change and you will need to dose.
By way of analogy: Imagine that you need to take a road trip. Your car has a gas tank that can hold 10 gallons of gas, and it gets 30 miles to the gallon. You want to make that road trip without refilling your fuel, and you ask if there is any brand of gasoline you can use to make your trip without refilling. And the answer to that would be... sure. Any of them and none of them. It depends on how long your road trip is. Some brands might give you slightly different results than the others, but fundamentally it's not the brand of gas that determines whether you need to refill. It's how long you need to drive. If your road trip is under 300 miles, then any brand will work. If your road trip is over 300 miles, then probably none of them will satisfy your desire to not refill your tank.
So it is with salt. No matter what brand you use, your levels are ultimately limited by the fact that you can only mix so much salt (35 ppt) into your water. If your corals use up what is there faster than you do water changes, then you will either need to do water changes more often (sometimes impractically so) or dose.