In the professional Tool World, there are a few names at the top. Snap-on, Mac, Matco and GearWrench just to name a few. The prices for similar tools can vary between them with Snap-On near the top and GearWrench at the lower end of their spectrum. Unless you are planning on making a living with your tools, the average person does not need to spend money on a Professional Grade set. When it comes to hand tools, just about any grade will work without much of an issue. As you get into more specialty stuff like ratchets and impacts, I would look at a nationally branded choice like Craftsman or Dewalt for example. Milwaukee has come a long way over the years as well. Lastly you have some tools very specific to your brand. I am talking about clutch pullers, flywheel stops and seal install tools that are different from one application to the next. You will likely be limited on the source you purchase them from and will pay a premium to get them.
A little background on me. I am a third generation mechanic. Aside from growing up wrenching on our family’s race cars, I put myself through college working part time as a professional automotive mechanic. After graduation, I moved to the sales side of Service Repair and have held various positions from Advisor to Store Management with a combined 20+ years in the industry. Early in my career I amassed mostly Professional Grade tools, but grew up in a Craftsman house. Later after not wrenching for a living, I mostly buy name brand tools, because I know if I have a problem with them I can head to any hardware store and have them replaced. Now my toolboxes are a pretty mixed bag of Snap-On Hand Tools (leftover from my Mech days) along with Kobalt, Craftsman and Dewalt. I have had Husky, but was never thrilled with their quality and Harbor Freight can be hit or miss too.
…and yes, I own at least three 10mm sockets!