Ok you mean between Vu85 and Mi75 and Samsung Q90A? My opinion - as some of the other fmers might disagree and I don't mind that however my logic is different from the crowd's in this subject.
1) Vu 85" tv - I had a Vu 4k 55 which is still in good shape, bought by a tenant who was so happy with the tv that he bought a second tv as second hand from me, a Sony 2016 flagship model. 85" model is a good value for money however I don't know yet about Vu's after sales service in and out of warranty. It is a huge risk but a certain attraction - 85" screen and good enough brightness. Very less is known about this TV yet.
2) Mi 75" - it is trending in this forum but a few complaints about ARC and ports handshake issues not withstanding 6 out of 10 folks would recommend this TV here.
3) Q90A 75" is another excellent tv choice and among the three as a brand and quality is the best choice. It costs 3.9 lakhs though. I am not a Samsung fan but if you limit to these three TV's Q90A is the best.