Is it better to deposit the 800k baht for a Thai retirement visa from Wise or from my UK bank?

Sure they prefer pounds, they get more from the exchange rate.

Nobody gives a rat ass where the money comes from, as long as you have 800k in a Thai Bank account.

Mate 800 baht is 800 baht do you think they actually care

It all depends on who you bank with, in UK & Thailand. I use HSBC and the HSBC transfer fee is £4 and I transfer UK pounds to my Kasikorn account to get the best exchange rate and there are no additional transfer fees. I've never used Wise but from what I've been told by friends who do use it they pay more for the transfer than me and get a worse exchange rate. You need to check YOUR bank's transfer fees and exchange rate as each sending bank will differ as will each receiving bank. As an example before moving over here, 14 years ago, I used Lloyds bank to do the same transfer and they charged me £18 transfer fee then there was an agent fee in UK (about £20 if I remember right) to do the transfer plus another agent fee in Thailand to receive the money and transfer it to Kasikorn and the exchange rate which was done by the Thai agent was very low. I'm sure that some of the people who are saying Wise is best are not lying as their banks could be charging very high fees but others may not even have checked, you need to find out what is best for you based on your banking setup.

They couldnt care less where the 800k bt comes from as long as it's seasoned in the Bank for 2 months...before you apply for your Retirement Visa...

Wise has a pop up box where you can confirm the money came from another country.

WISE provides better exchange rates

I know things change but when I did it I just opened a 'high interest' account and transferred 800K from another Thai account.