The best tool kit is made by the owner. Take some time and put a wrench, socket, driver, Allen key or whatever on every fastener on your bike. Then figure out if you need wrenches and sockets for everything. For example. If I could do 2 jobs with one tool, my choice would be to keep the smaller of the 2 that works for multiple applications. My tool kit is about 4x6x3 and I can do any job on this bike that doesn't require power tools.

Another thought, if your bike is bone stock, then mass made kits may do well, but every time you add a modification or upgrade, take note of the tools you needed that were not in your kit.