Why so many models in Galaxy A5 and Which is Better ? My model id A500G/DS

[brahmaji1234]

why there are lot of models in Galaxy A5 and Which one is better ?????

Samsung Galaxy A5 SM-A500F/DS, SM-A500G/DS, A500H/DS, A500M/DS, SM-A5000

Samsung Galaxy A5 SM-A500F, A500F1, A500FQ, A500FU, A500H, A500HQ, A500K, A500L, A500M, A500S, A500X, A500XZ, A500Y, A500YZ

what is the difference between Galaxy A5 and Galaxy A5 Duos ???

 

[Rieder59]

Whilst no expert I have the A5 and a fine phone indeed, a good choice I made. The duo is the same phone but allows dual sims and you can take calls to/from both. The second sim sits sideways in the slot where the SD Micro Card normally goes. You cannot use the SD Micro with the second sim in situ.