Impossible question to answer unless you learn all languages and compare~ I learned English easier then my mother tongue. But I'm born and raised in England so that helped lol~
Korean is the easiest to read and write from what I've seen and heard but I don't know how spoken Korean is
It usually depends on the language you speak originally. For example, If you speak English then you would find German, Spanish, or French much easier to learn than Chinese. For most people, the hardest to learn is English since English has words that can mean 2,3, even 4 or more different things. That being said the easiest language is Gibberish. Everyone can speak it no matter what language they use.
This question is ridiculous if you ask me...If you hear a language being spoken around you more often,you are gonna pick it up more easily...And if that period is your childhood.then it is even more easier...Seriously!!
Malay/Indonesian, Hebrew and Italian. Nothing else are easier in my opinion. People say Russian is easy, but I get intimidated by Cyrillic. For me, Japanese is easiest, because Malay share the same ancestry with Japanese and up until we stopped using Melayu Baku, Japanese and Malay had the same grammar style and sentence structure. It's still similar, but not really the same anymore since nowadays the Japanese new gen like to shorten and combine their words and use weird sentence arrangements while Malay new gen like to create strange words and use active sentence structure. English is probably the hardest language, since you have different pronunciation for the same things, overly complicated grammar and exceptions in everything. French is really intimidating because the way you pronounce stuff is not the same as how you write them. Korean is hard to pronounce because it twists a lot of your tongue, but the writing system is very straightforward. Thai is really hard to get the tone right and its writing system is so archaic, it's widely believe to have nothing to do with modern spoken Thai, although they still use that writing system. Arabic is hard because a slight difference in sounds can mean something entirely different and if you didn't grow up with Arabic, you just have to accept that at some point, people will misunderstand your words. But if you can can handle the sounds that seem very similar but actually very different, you can learn it quite fast. The sentence structure for modern spoken Arabic is quite straightforward. Just don't expect to read and understand the Koran. That's Classical Arabic. Don't know anything about Vietnamese or Tagalog, although I do watch Tagalog serials when my nieces watch it on TV.