Tipo or Tipo dual

Please help me out :
I would like to buy an android mobile . Finally I decided on Tipo . But now the confusion is whether to buy tipo or tipo dual ?
I heard that android phones with dual sim will be slow and consume more battery compared to the same mobile of single sim .Is it true ??
And If we dont use one sim in dual sim mobile , will the performance and battery be the same as normal single sim mobile ??
**Dual sim is useful for me but not compulsory .
 
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