I used to not always use a decoy, then, for a time I used quite a few, at least two, usually three in a set, and sometimes even more. Now I use one or two, and always at least one, regardless of the time of the season, unless I get caught in a situation where there is no opportunity to set a decoy out, which has happened to me occasionally.

IMHO, even later in the season a tom needs to see what he thinks he's hearing or he'll "hang up" out of gunshot range more often than not. Admittedly, I don't hunt in a lot of heavily, heavily pressured areas, and I'll concede that, in those areas, a tom would probably run the other way if he saw a decoy in late season. In later season, though, I will use a fishing line and try to create some lifelike motion in my decoy.

I think the Sceery inflatables are just fine and I use mine often. I also like my Delta hen, my Carrylites (though they are big and cumbersome) and my passive jake. They all work, and I vary their use (mostly according to how I feel at the time, which is probably the wrong way to decide what to do) throughout the season and the areas I hunt.

As for box calls, I have a Quakerboy Grand Old Master that has been with me since day one, and will always and forever be my most favorite box call, though I also have a Primos Lil' Heartbreaker that I think is really sweet.
I also use slates, glass, frictionite, pushbuttons, fighting purrs and, mostly, diaphragms.