I started off with Battery 2, way back, and then upgraded to Battery 3 when it was released.
Since buying X1, I have also been experimenting with SD3, and I also purchased BFD Eco, just to see what it would do.
Before I got into soft synths I used my Alesis DM5, but since Battery, I haven't even turned my DM5 on, and I should sell it. Trouble is, I made a load of triggers for it so I am reluctant to part with it at the moment...
As for the soft synths, I think that most will agree here, that each one has its good points, and it is nice to have the choice.
I'm getting more into BFD Eco, and I may, in the future, upgrade to full BFD, in order to have the greater flexibility over what instruments can go in each of the tracks. Eco does not allow you to create an all cymbal kit, whereas I am lead to believe that full BFD does.
I've not tried any of the others...