Which is more important in learning to speak English, accent or grammar?

 Both are important.To be more professional in English Language you need to take them at the same time both with practice and you will see the best results

All of the above, in fact. You cannot take one from another and then learn them one by one. All aspects must go together in unison and fairly inter-communicating. 

Both but first u should learn to speak correctly then comes the accent

l think it is the grammar. Accent does not matter for everywhere English goes it creates a new accent from the language of the people there. 

Confidence at the first place and then grammar. Accent has to be neutral. 

You have to get the grammar right in the first place.......if not perfect should be such that doesn't look funny atleast..like the question u asked...it may or may not be perfect in grammar...but it was such that everybody understoond it.

Not sure, you can get away with bad grammar, a poor accent is quiet intangible for anyone as no one can understand what you're saying regardless if the grammar is good.

more important is accent because we cant understand each other if we not  learning it  and the grammar is important for didacticism 

Just display of accent makes no sense without good grammar. 

So grammar comes first when learning English, followed by accent.

I go for the answer by Mr. Denis. And I do vote it up. 

 

If your intention is learning english by yourself I advise you to view "engvid.com" and "privateenglishportal.com" it provid the best english learning ressource for both grammar and accent, good luck.