Matty, I can only answer that for myself. I started to use Spotify about a year ago and ever since that's my main way of listening to music, at least when I am at home. Yes, I do like to own my favourite albums as well and I do buy them from my very favourite artists - eg. MJ - but I rarely listen to CDs now, I use Spotify. Why? As with everything it has advantages and disadvantages, so it depends on what a person likes.
Advantages are:
A very wide variety of music at your disposal. Not just the albums you bought, but you can listen to virtually any album that was ever released. Well, those which are on Spotify. There are some which aren't but the available music is still huge, a lot lot bigger than what you can ever own at home. I would not be able to listen to all these albums, all this music if we were still in the 80s and 90s and you had to buy an album to listen.
From all that music you can create all kind of playlists. Of course, you can do that on iTunes as well, or own your computer with MP3 playlists etc., but again you only have a limited amount of music and albums at home, but at Spotify you have almost everything.
I also think the streaming stats count somewhat in the sales/chart positions of an artist. Not sure how much, nevertheless it's interesting to see who is popular and who is not so much esp. in the case of not current artists. You can find some interesting facts, like "wow, this song was such a huge hit when it was released and now it barely has 100,000 spins, so it did not prove to be that presistent after all". Or vica versa. Like in the case of They Don't Care About Us which I think did not even break into the Billboard Top 40 when it was released but now it's very popular on streaming services. It's not necessarily important, but these stats do show some interesting facts and tendencies abour whose music has staying power and whose not so much.
As for the price. I don't think Tidal has, but Spotify has a free version. The downside of that is the advertisements and that high quality streaming is not available. So for audiophiles it is not that great. I am not so much, so it is OK for me, but if it isn't to you you can switch to Premium account for $4.99/month. I also think the Premium account makes it possible for you to listen to music in off-line mode. I'm not sure how that works.
I guess it's just what someone prefers. I love the fact of so much music at my disposal and to be able to explore and discover albums and artists I have never heard before and then include what I like in my playlists. To me that is the biggest advantage.
BTW, those Sony docs which were leaked due to the hacking scandal not long ago reveal that the music industry is moving more and more into the direction of streaming. The docs said that not even music download like iTunes is that popular any more, it's all about streaming. I think the industry will never be able to turn back time and make people buy albums and music like they used to. Times are changing, customs are changing, technology changes. They try to find a way to make profit from these current trends, rather than wanting people to start buying albums again, IMO.