I’ve only used the Mr Colour levelling thinner but it’s helped by making its easier to learn to airbrush imo. I may have to try their normal thinner one day just so I have something to compare it too.
The super clear 3 is amazing. It levels better then the clear colours. Some of my 3rd and then 4th coats were fairly heavy and it’s levelled and is very smooth. Much better then the Tamiya rattle can clear

if I got heavy coats like that with a rattle can, I would have ruined the paint job.