The second is better. Readers enjoy poems more when proper language is used. It shows that you are more serious about writing and it just looks better. Also not many people comment in the slang poem section of this site so you have better chances of people commenting and rating your poetry in a more visited section.
I don't know if you wanting us to vote for this but I will anyway based on the second version. I give a 4/5. I hope you take my advice into consideration and maybe praise my comment.