They're both gibberish; do not use either one. I am not sure why people are teaching "wanna" as a word. But those teachers are very incorrect. It will not sound "natural." It sounds stupid. "Wansta" is just an abomination. Eliminate both from your vocabulary.

They both mean want to, but are used with different subject pronouns. I wanna, you wanna, we wanna, they wanna. vs he wansta, she wansta But this is only for spoken English and is very informal. But it does sound more natural than saying want to.

https://en.wiktionary.org/wiki/wansta To be honest I've never seen it written, because it's incorrect. I just heard it in the very fast speed. If we wrote how we speak , it would be a nuclear mixture that destroys beauty of the language and spreads madness :D

As well as spoken English it's used on social media platforms such as Twitter among my generation, but I wouldn't worry about it. "Wansta" is stictly spoken English and "wanna" in certain contexts may look weird when written anyway, so just stick to the correct forms of the words :-!

I’ve never heard “wansta,” but maybe it is a shorted, informal version of “wants to.” “Wanna” is a short, informal version of “want to” — as in “I wanna [want to] go home.” Maybe “wansta” is “He wansta [wants to] go home.”