I've played the press release preview versions of both...
Like I said in another post, I believe SF to be more of a WW2 Battlefield simulation, concentrated on armor and it's support units.
While WW2 BT's is less of a battlefield simulation and more of a one man armor simulation with limited support.
Both have mission editors, one has MP (WW2BT).
Lets put it this way, print out the key command list for WW2 BT and it is one full page long, print out the key command list for SF and it is four pages long... that should give you a clue.
