I was a bike shop mechanic for 5-6 years full time and a few more years part time.
I never liked separate Allen keys. Too easy to lose and they slow you down too much changing sizes. Having to step away from the stand to the bench.
I used a Park Tool multi-tool (AWS-10* – 1.5-6mm allen keys only). Cost £10. I went through about 5 sets but almost all were due to being nicked by my colleagues. I still have some that are 10+ years old. They’re a little loose fitting now but still work enough. Only thing is you have to tighten the bolt up occassionally.
Ball ended comes in useful once every couple of months but otherwise not at all. I had a Park Tool ball end set and an Ice Tools one. The Ice Tools one was better for my money. Handles cracked on both sets but more easily on Ice tools. Works just as well without them.
As a home mechanic I have a cheap Draper set of ball ends and a bunch of the park tool allen key multi-tools.
I’d save your money. That said people like shiny expensive things so go for it.
Screwdrivers on multi-tools are awful though.
* Now largely replaced by AWS-11 which has an 8mm and as a result is too big and heavy. Really you need a multitool with 4,5 & 6mm on. That does 95%+ of the bike.