What color roux do you prefer for sauces, and what’s your secret recipe?

Roux and stock are basically magic ingredients for sauces and a sauce that fits to a dish in huge taste improvement.
For those who don't cook a roux is roasted flour or starch in any kind of fat. Most common is roux with butter and wheat flour. However roux tastes very differently depending on level four or starch was roasted before it was mixed to a sauce.
Personally I like white roux for Bechamel sauce with nutmeg, that fits to Bolognese and cooked veggies. It's practically just shortly roasted flour in butter and cooled down with cream or milk.
Another roux sauce I like is darker roux with butter and wheat flour, cooled down with chicken stock and spiced up with marjoram, white pepper, thyme a drop of white vinegar and Worcestershire sauce and a spoon sugar.
I practically never made dark roux because it needs at least 10 minutes and clarified butter, because normal butter will burn. It's easier to use dark sauce binder.
What are your preferences in matter of roux and what is your secret receipt while making sauces with roux?

What color roux do you prefer for sauces, and what’s your secret recipe?
What color roux do you prefer for sauces, and what’s your secret recipe?
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