I've mainly only used generic containers/holders and have to check out that wingspan one you mentioned, but I really like x-trayz. They are so useful with a few different shapes, and stackable.

oh and I supposed to answer my own question:

(are we allowed to do links here? I will drop them if joe)

top organizers and accessories for me are probably:

quick draw and setup on wingspan from Etsy, lets me set up the entire game in about 3 minutes, wife and I play it all the time in part because of how quick it is to set up and tear down.

so many little things for Arkham LCG, I've gotten card mats with custom images on them, mythos draw bags, connectors for locations and stuff.

Not a huge fan of inserts and I end up tossing them more often than not but the basic Res Aracana insert is one that I find exemplary. It doesn't make the box larger than it needs to be, it has room for both expansions and most importantly it serves as an ergonomic storage tray during the game.

I've seen third party inserts that looked tempting but they were too expensive and organized things differently from the way I liked. In particular I like to bag together everything that a given player color needs for their setup, that way I can just hand everybody their own bag for their personal setup.

My favorite accessories are a couple of very cheap sectioned trays that I use as component trays for almost every game and some simple card holders for games that need it.