A Corporate/General Aviation mechanic here, about 29 years worth. I still own and use the very first set of Snap-On tools I ever bought as an apprentice mechanic in my Dad's Aircraft Maintenance Shop in CSG. I also have a handful of oddball tools (Craftsman/Matco/Every-other-brand) that I'm willing to heat and bend, or cut and weld on.. to make that one-time special tool that absolutely no one manufactures. But by far, the Snap-On tools as far as I'm concerned, are worth every penny they cost.. in strength, specific fit and weight. I LOVE to have in my hands a tool that is so light that I don't tire of holding it, yet trust it to be strong enough to do what is required of it. I know the home address and phone # of every Snap-On dealer I've ever bought from in my area, and I have visited all of them on the odd after hours occasion that I needed to buy or exchange a tool.
I "free-lance" now and since I move from one customer's hangar to another as jobs change... my toolbox is a bit unique. I custom built a frame that holds a combination of Snap-On and Mac drawer sets, mounted on a set of 6 pneumatic casters (free-turn at each corner, rigid straight paired in the center). It will rotate in it's own length for ease of navigation around tight hangars, and has a tow-bar attached on a permanent hinge that folds upward like bar on a car towed behind an RV. I can hook it to my pickup and easily move across the ramp and between hangars. It has multiple electrical outlets wired to a reel with a 100' cord. The same arrangement has a series of air outlets connected by manifold to a single 100' air hose, I can plug in one hose and electrical cord and power up everything on my box, including a nice stereo to listen to

I also have a full "Taco-Wagon" Snap-On box in my T-hangar that I can work out of when my normal tools are scattered hither and yon across the airport.
If tools are worth earning a living with, they're worth being the best you can afford.
"The bitter taste of poor quality lingers much longer than the fleeting satisfaction of low cost"
Dave Danger A&P/IA