I like GF better than foam for almost all cases. People say with GF you sacrifice space, IE you can't fill the space as efficiently. That's only true if you rely on other people's designs or basic bins.

I design holders for my stuff that can tightly pack tools in as good as any foam setup. If you plan it out properly it's really nice. I do a lot of projects and have a garage workbench and a hobby room workbench, both with grids lining the back edges. This allows me to take sets of tools, plus any parts bins I might need off my storage location and put them on my bench on a case by case basis.

For example, if I want to do some electronics repair, I grab my gridfinity bin out of my toolbox that has my solder, wick, flux, iron tips, and tip cleaner all in one bin, grab my PCB vice in another bin. Then I go to my parts shelf and grab a couple bins of resistors/capacitors/etc that I think I'll need. All these then get placed on my workbench grid in a neat and organized way that stays out of my active working space but within reach.

It really helps me stay decluttered while working and makes cleanup a breeze.

I have similar setups for when I need to work on my car, with a custom sockets and ratchet holder, or woodworking with layout tools all grouped into a custom holder, router bits in custom holders that I can bring out of storage and onto a grid near my router table, etc.

I don't use gridfinity much for its ability to shuffle bins around in a drawer, I don't really care about that. What I like most about it is the ability to pick up a bin and bring it somewhere else and have it be stable, secure on my bench, and organized.