The tool is less important than the skill level of the person who handles it. A few years ago bought a cheapo "Bike Hand" tool kit from Amazon for $40. I've used this kit extensively since then, using it to dismantle and restore my Brompton and my Moulton Stowaway bikes. I also used it to build my GT Grade Carbon and Xizang bikes from bare frames to complete machines. I have had no issues with these tools. I did have to buy some additional tools, a headset tool and cutting guide for fork tubes. When I worked in a shop and had to repair/assemble a dozen bikes per day, pro tools were good to have. But now I work on bikes now-and-again, and cheap tools work perfectly well.

For a fixed cup which worked its way loose, I would clean up the bottom bracket and shell, clean the threads with a wire brush, and put the cup back on with Loctite. If it were a cheap bike like the kind I learned to wrench on, I would "stake" the cup and shell with a chisel (Loctite wasn't yet a thing in those days).