The quality of he master also makes a difference too, and in the same way that you can see the difference that HD and UHD TV sources make when watched in SD, a decent master can still be distinguishable on lesser replay equipment. Tidal benefits from the MQA mastering even if you do not get the full MQA stream or haver an MQA decoder - not sure about the free tier. I have a feeling that Qobuz also does, but I think that is probably it as far as audio sources are concerned.
For anyone thinking of doing this, be aware that you would need to sign up again with a different email address. With Tidal, once you have signed up with an email address, that's locked forever into that region. I signed up to a free trial that at the time not realising it was not UK. Even after approaching Tidal to change, they could not help and I am forever locked into a non UK region. I could sign up with a different email address, but the region that I am locked into is actually cheaper than UK pricing so I am mostly happy to stick with what I get. Even Tidal suggested that I stuck with what I unintendedly had due to the pricing differential.
I say mostly happy, but something to be aware of is that the region determines what audio you have access to. I don't have the full Pink Floyd catalogue for instance, but UK subscribers do.