Hi
I like the Fan edition name. However, I would always play with the Fan Edition. If GW would still sell ships and rules, perhaps the official edition could be something good. However, as the game is abandoned, no questions about the rules will EVER have an official answer. Until Seahawk or some other veteran can buy the rights to the game from GW, we will all play some kind of Fan Edition, as we will have to make up or agree on rules.
I feel that for the basic rules, the rulebook and the 2010 FAQ does a good job. For the individual fleets, use the official ones or the FE editions, as you like. The primary point is to play games. The secondary is to have fun. The game should reflect your understanding of the 40k universe. The game should NOT reflect GWs abandoned rules.
I do not think anyone are so blessed with BFG opponents that they will seriously pass up games if people do not play with the official rules.