Tails OS is only useful if all you want to do is buy few drugs or blowvwhistles on government or any other one off thing. But for daily driving tails OS is terrible.

The main selling point of tails is that it is amnesiac but I’m pretty sure most people will want to save some data on there device.

even though I’ve set priorities .onion but in reality most website I need are on clearnet with no onion mirror. I know this can open to network analysis attacks but I’m OK with it most of the time. (LEA Already knows I visit 7000 times a day). But back to the point all these clearnet site share data With each other and this could lead to cross contamination and sites able to build a proper profiles on you. Tails can’t do much here but with Qubes you can compartmentalize.

If you want to login to your bank account or some other site where you don’t want yo use Tor but still not share anything more than you want to Tails has no solution you will be forced to use a different less secure and private OS but again with Qubes you can create separate VM that will only connect to your bank directly.