My experience with iTunes has been very positive. I started ripping all my CDs as either AIFF or ALAC lossless files about 8 years ago. I really can't tell any difference between the two. I have 4 systems in different rooms and I stream my ripped files wireless from either an iMac or a MacBook Pro to either an Apple TV or an Airport Express and use the optical output to a DAC. We use our iPhones or iPads as remotes. In my opinion, the SQ is as good or better than several systems I have heard with dedicated music streamers.
In 8 years of use I have never had a dropout, cutout, navigation issue, or slow loading pages with iTunes. Actually iTunes has always worked flawlessly. During that timeframe I have installed several versions of MacOS and several versions of iTunes all with no problems.
I typically do not use online music streaming services but i have had several free trials with Apple Music and Amazon Music. I found Apple Music to sound better than Amazon Music but both are fine for casual listening or background music. For serious listening they don't compare with my lossless ripped files.