Not claiming expertise, just a few miles on the clock here, but my 2c worth with the ones I've used.
All these paints need thorough mixing, I pop a 3 or 4, 3mm marine quality stainless steel nuts (not BB's) in the top & shake like I'm on the dancefloor.
Vallejo:
ModelAIR (black lid) does benefit from a little thinning, with their thinners, flow aid and tip-dry retardent. Prefers primered models.
I've binned the Polyurethane primers (except where the colour matches German RAL) as they aren't workable & don't suit the way I re-work models.
DON't Use any form of alcohol/IPA thinners, it will turn to sticky goop.
MIG
like them, good colours, not as twitchy as VJ, tolerates handling better. My current go to, if I have the colour in stock. Medea or VJ thinners.
Hataka
I have the UK Armour Early War set, I like the colour matches.
BUT, the twitchiest paints I've used.
To get any results, you 'have' to use their Hataka thinner on PRIMED models, or it just.doesn't.stick.to.it.
Nice finish possible.
Others will be able to give informed opinions on the others.