I usually stick with Amber because I’m not really into a heavy maple taste. Like Mufflon, I don’t recall the dark being butter, just more pronounced. I visited a place where they made maple syrup and did a tasting. It was fun. But it was a few years ago.
I don’t think there was a huge difference between the Amber and dark but I didn’t like Golden or very dark.
Maple Syrup Grades in Canada & U.S.
(In terms of taste, the lighter the colour, the lighter the flavour.)
Golden – delicate taste, clear and light enough that 75% or more light will shine through it.
Amber – rich taste, light enough that 50-75% of light will shine through it.
Dark – robust taste, only 25-50% of light will shine through it.
Very Dark – very strong taste I’m not sure I’ve even seen any of this in real life. Less than 25% of light can pass through it.
In terms of taste that means, the darker the syrup the stronger and heavier the flavour. If you like a nice light tasting maple syrup, you should choose the Golden syrup. If you like something stronger, go darker.