Some general thoughts on tool-buying;
Screwdrivers, spanners, hex keys, bit sockets etc – definitely pay a bit more because cheaper quality ones strip heads and bolts. No need to buy bike-specific branded general tools as you will get more bang for your buck with non-bike brands.
Torque wrenches – get a good one because there’s nothing worse than breaking an expensive carbon part or even worse, a frame.
Specialist bike-specific tools for specific bike-only jobs – run a cost analysis. “How often will I use this tool vs how much does the local bike shop charge to do this specific job with their own tool?” If you have a lot of riding friends then think about setting up a ‘tool pool’.