Sweeter, fruit woods ( peach, cherry, apple ) pork, chicken and fish, cheese
Heavy hardwoods ( mesquite, hickory walnut) heavy cuts of red meat. Briskets, chucks, tri-tips, big steaks
Mild hardwoods ( alder, oak, pecan ) pork, chicken, cheese and even red meats.
Now - to really throw you a curve - look at some of the flavoring/aroma pellets ( not for fuel) from Milt's Original. He is a sponsor here - and makes some really amazing combinations.
These are just my favorite combos - but much of it depends on your tastes.
Have fun!
T