I live near several of each of these stores: Harbor Freight, Home Depot, Menards, and Sears. Consequently, I've also spent a fair amount of time inspecting the tool cabinets at each of these stores. For me and my dollar, the Craftsman and Husky cabinets are out of the running. The Masterforce at Menards and US General Gen 2 at Harbor Freight have thicker metal and better features overall.
*Masterforce boxes are 24" deep which is super nice; US General boxes are 22" - respectable.
*Masterforce has a five sizes: 30", 36", 41", 46", and 72"; US General has four sizes: 26", 44", 56", and 72".
*Masterforce boxes come in 4 colors; US General boxes come in 6 colors.
*Masterforce boxes come with built in power strips that include USB charging, which is very well implemented; US General have a magnetic power strip accessory for $30.
*Masterforce top boxes have more usable height in the upper compartment located under the flip top (from Menards website "...tall open till design...", which makes use of that space perfect for battery chargers, etc.; US General boxes have less height and thus that space is less usable.
*Masterforce 41" and 46" top boxes have a stainless steel pull out work surface which I personally really like. I'm not sure how much it would get used but it's a unique feature.
*Both Masterforce and US General lines have various side box options.
Personally, I like the US General boxes over the Masterforce. But, the Masterforce beat US General in three areas: "tall open till design", built in charging/power (top and bottom boxes), and 2" of extra depth. For me the 22" vs 24" is trivial. But the "tall open till design" is a huge deal; it really
makes that upper compartment in the top box very usable. And the built in power strips are perfectly implemented.
Masterforce boxes and, especially, side boxes are noticeably more expensive, which makes a huge difference. Noticeably, the Masterforce 16" side locker is $390 vs US General 16" side locker is $220. The Masterforce cabinets go on sale and sometimes also have an 11% off during the sale price. US General boxes go on various sales or have coupons. But, in the above side locker example, one could buy two US General side lockers to one of the Masterforce.
Here's a video from ifirefight1 on Youtube
about the drawers on the US General Gen 2 box. He has a couple other videos about the Gen 2 boxes on his channel.
Here's a
Masterforce 56 Tool Box Review search on Youtube.
Here's a
Masterfoce 41 Tool Box Review search.