A lot of it depends on your own eyesight and the peculiarities thereof. Yellow/amber may work for an indoor range where the lighting does not have a stiff lean into the blue end of the spectrum - but most flourescents do just that. Given the same UVA/UVB rating of yellow/amber and grey lenses, you might find that the grey work better for you. Then again, some folks say the "brown" tints are the bees knees.
Presuming you do not need corrective lenses, I'd see about borrowing different tints before you invest in one of each. If you do need corrective lenses with tints, PM me for the info on an eye doc who is also a bullseye shooter and quite comfortable with your bringing your hardware into the office to make sure the RX is written for and the lenses are fitted for your specific eye/arm/hand/barrel length. He is the one who helped me understand the differences in how eyersight responds to tint under the same lighting situation.