The best scuba or snorkeling mask for using with a beard is going to be one that fits your face the best. I recommend one that has a skirt that doesn't cover too much of your mustache or beard if possible. For me the Octomask and my Tusa mask fit my face well and only overlap the hair on my mustache a tiny bit.
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One tip to get the best seal with your mask when you have a beard is to use beard balm.
Another tip is to wet your face including the hair on your face before putting your mask on.
To maintain a good seal while diving or snorkeling, keep the suction on your mask by inhaling through your nose or pressing on the mask as needed. You might get such a good seal that you'll need to relive some pressure while ascending or descending also.
