This topic comes up all the time ... the eternal struggle between truck and non-truck tools.
I'm not a professional mechanic so I'm expressing a non-pro's opinion only. And I'll limit my response to basic, hard-line tools only and use SO as an example ...
1 -- There are numerous non-truck brands that are essentially equal to SO and are significantly less expensive. Wright, Proto, Williams, Armstrong, SK, come to mind; however, ....
2 -- These other brands may not necessarily make all of the specialty automotive-specific tools that SO sells; and .....
3 -- These other brands do not provide door-to-door truck delivery, face-to-face warranty coverage, or financing.
If these last two items are truly important to you, then buy from the truck. BUT (and there's nearly always a "but"), viewing life with the eyes of a old geezer, it is extremely foolish for a young guy to start out by selling his soul to the Truck Man. Don't drink the SO Kool-aid!! Start out buying good quality, non-truck, hard-line tools and limit your truck buys to only those tools not available in non-truck brands. (I mean, really, is a 120 tooth ratchet truly FUNCTIONALLY better than an 80 tooth ratchet???)
Use the money saved for the other important things in life like food, rent/house payment, car payment, retirement IRA savings (yes ... start saving on day One of your work career for retirement 'cause SS isn't gonna be there for the young folks), health insurance, education, kids shoes, etc., etc.
Once you get established, then start replacing the non-truck tools with truck tools, if you think it's necessary (you may find the original non-truck tools are perfectly fine for your work).