Define what type of trip you want, then it’ll be clearer which destination is best. And your ethnic background will make a big difference too. Language abilities as well. For example:
Italy is fairly racist towards Black people, and all of Asia isn’t a fan either (that’s why women there stay out of the sun). People in Italy and Greece will be able to speak some English, but in Japan and Vietnam much less. So if your dream is to have ladies in awe, then go to the UK if you’re American, for example. They’ll find your accent cool, there will be lots of different ethnicities, etc. You can even take a train from London to Paris for a two-day visit to a completely different country, language and culture.
Another aspect is “hitting the wall” with ladies in Asia. I don’t mean the age definition. Look it up or DM me. It’s real and it’s not fun. I was warned about it but didn’t believe it was a thing until I spent 15 years in Asia. And I’m average.
Or let’s say you want to feel completely disorientated in a very foreign culture. Then Japan is a good choice, but try to go outside of Tokyo. The countryside is a different world from the big city and something you will experience nowhere else. Nothing will be in English, everything will have a local feel…people will be curious about you, and some will go out of their way to help you and talk to you.
If you want “commercial” hookups, then no country will be like Thailand. They literally have entire streets of bars just for that. Due to the history of US servicemen stationed there, they are very used to American men of various types. It’s super easy. In Japan, a lot of those places don’t even accept foreigners (because the staff don’t want to deal with a different language, people who may not understand the local system, etc.).
If you want to see historical architecture and enjoy real pasta and pizza and the best ice cream in the world, then Italy can be cool for a few days.
Etc.
So define what you really want to experience most, and who you are (age, ethnicity, etc.), then there will be places that will be spot-on for you.