I always play with a 4-1-2-2-1. Either with an attacking style if I am a big team or control if I play with a lower club. I usually have great success with it
I use Quatesh Balista 4 - 2 -3 -1. I have used it for a while now the attacking play is devastating. Ive yet to try any of the newer ones because this has been so good.
I am in love with the flat 442( no matter attacking or defensive) although I have à small crush on the 532 using wingbacks, an approach I am Currently playing with.
I like a lot of variants of 4 - 3 - 3 or 4 - 2 - 3 - 1 with wingers but if you have no decent wingers I like this formation lately, because it gives me a lot of scoring (opportunitys)
I make my own depending on several factors, but I've been most successful with my 4-3-3s, although I achieved massive success with a 4-4-2 in an Everton save.