The intensity of smoked flavors depends a lot on time and temperature, thickness of the meat and how it is treated beforehand, skin-on or skin-off, with birds, brined or unbrined, injected or natural, rub applied or no rub, mops, glazes... Well, it's a long list of factors, and I've pretty much played with all of them.
Everyone has a favorite wood, and most are indigenous to whatever area in which you live. I use hickory for a stronger flavor, going low and slow, apple for a milder, sweet flavor, and soft maple for a very mild smoke with more delicate meats. I often combine two or three different woods for a more complex flavor.
I would caution in the use of woods high in tannins, though, like oak and black walnut, which many stomachs cannot handle. (As an aside, black walnut chips or shavings in horse bedding is a no-no... it will kill a horse in short order.) Also, don't even think about using locust! Though it burns very long and hot, it is very high in creosote content, and is, as far as I'm concerned, the very best firewood around. When I run low on fodder for the wood stove at the end of long winters, I often take down a green tree to make it until warmer weather. It burns just fine, as locust does not retain much water over the winter because of it's density, and the high creosote content. Not good for food, though.
I do most everything on Webers set up with a 3/8" stainless plate atop the cooking grate, then use a spacer to lift another grate about 1 1/2" above that for offset smoking. I even do bratwurst in this manner (DO NOT pre-cook a brat in beer, for God's sake!!!), and they are fantastic! Burgers are done directly over very hot coals with a handful of wood. I throw the burgers on, cover with the vent slightly open on the lid, wait a couple of minutes, flip, cover again, another couple of minutes, and they are perfect. Better than any burger joint I've ever been in. Then there's turkey...
I could go on and on, but you get the idea.
Happy smoking.
