i don't think anyone mentioned brand, just size.

i use mostly hazard fraught tools at home, don't have problems with them, but they don't get used much.

it's important to remember who owns who now.

https://pow-jrk.netdna-ssl.com/wp-co...hat-Brands.jpg

so while unaware, you literally asked if a scion or toyota was better.

stanley is their lower/homeowner grade stuff, dewalt is considered more of their contractor grade stuff, and does cost more.

either is perfectly fine, in this case, the cost is related to how much use/abuse the tool can take. if you're just tinkering on the car in your free time here and there, stanley stuff is just fine. if you start doing major work all the time, dewalt is going to be a better option.

For torque wrench, get a 3/8 drive if you're going for versatility. Other than axle nuts, crankshaft bolts, and wheel lugs, you will be fine with a 3/8. A 1/2 inch electric impact that is torque limited to say 120 ft/lbs is a very useful addition later on for wheels and other similar bolts.

Never use extensions or adapters on torque wrenches if you're aiming for precision. Hence why I always suggest getting a 3/8 torque wrench for people first building their tool sets. You'll need the 3/8 way more (oil pan, trans, diff, brakes, etc.).

In terms of what brand, etc. I don't know what's available abroad. I'd avoid anything but higher quality for your precision torque wrench. If it fails you, things can get really expensive. If a cheaper socket set or set of spanners fails, you'll generally not hurt the thing you're working on.

In the US, I have had good luck with Craftsman torque wrenches. They used to be harder to find but now Lowe's bought the line so they're everywhere. Harbor Freight is a horrible, horrible option for torque wrenches. I love HF for specific things like trim tools that seem to all be made from the same company anyway and need to be periodically replaced due to wear. But a quality torque wrench should last your lifetime, even if it doesn't say SnapOn on it.

For some of the jobs you mention, such as trans and diff bolts, depending on the rust you encounter the one set of tools that will be useful will be a good set of breaker bars in 3/8 and 1/2 drives with multiple handle lengths. Breaker bars are cheap and prevent you from damaging all of your other tools when faced with difficult bolt removal. While they are usually pretty stout, if you do bend a breaker bar handle, it's not a big deal to replace it compared to a more expensive ratchet or spanner.