FB is where the action is, there's no doubt about that, when it comes to military. But without a solid economic and military backing from a top federation on the server or your own off-world empire, your FB experience is not likely to be a positive one and especially for newer players getting a feel for the game, experiencing FB as your first empire could very well turn you off from the game.
My personal experience with the idea of sudden loss of a couple months of building and growing came in the form of a war declaration last night in what is sure to be a one-sided affair beginning today. I am fortunate enough to have made this empire with GC and FB isn't my primary world, so it isn't the end of the world. For newer players though, a similar situation would almost certainly turn you off from the game so again I urge you to avoid FB until you have a sizable empire on another world.
War protection on FB doesn't last as long as you'd think, and the amount of military that you can build up without bankrupting yourself is a drop in the bucket compared to what you will face with established countries. In my personal example, my country has all secrecy turned on, with full 100.00 War Situation Index. The empire declaring war has 5 countries totaling 10x my population, is the leader of a federation, and has an army asset value in their capital alone that's 3x my total assets, featuring multiple Mobile military units, navy, and nuclear weapons. In short, it's over before it begins.
The aggressor in my war experience attempts to sell countries on discord, which there's nothing at all wrong with, but it does reinforce the idea that this should not be your first world. I have never had an interaction with the player and he's on the other side of the world. Don't assume that because you're active and turn on your secrecy settings that you'll be safe if you are non-aggressive early on this planet. I will survive, but only because I'm not based on FB. Don't make the mistake of making this your starting planet if you want to play the game long term.