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I have a very little knowledge about Arabic but as far as I know, both spellings are correct and acceptable. Use whichever you want but be consistent. 
<br>The short vertical stroke on top of *meem* is called *dagger alif*. The spelling with the *dagger alif* is commoner than the other one. However, the dagger alif is rarely used.  


The dagger alif occurs only in a few words but they include some common words like the word Allah ⟨الله⟩ (Allah) and ⟨رَحْمَٰن⟩ (Rahman). It indicates a long /aː/ sound. 


As far as I know, ⟨الرحمان⟩ is commonly used in Urdu (national language of Pakistan).