Choosing a white

In an effort to do something as the plans for my apartment renovation are being stalled by approvals, I bought a bunch of white paint and headed to my new place in Brooklyn to see if I could pick a color for the walls. Looking an paint swatches in the store I was convinced that 3 out of the 4 were actually exactly the same color and someone had clearly made a mistake, but sure enough as soon as I got the paint on the walls they looked completely different. How do people choose?! I brought along my decorator-savvy mother for advice (although really she just laughed at me the whole time). All four look completely different depending on light, where you stand... it's insane. At the moment my favorite is somewhere between white dove and cloud white, but think I'm going to need to by another round of tiny paint cans and tiny roller brushes and go through this exercise again. Ugh