Rental cost

Hi friends,

I will be moving to Basel soon.. I did detailed analysis about the rental rates in different websites but ended up with different ranges. For ex. I could able to see 2 - 3 bedroom apartments around CHF 1500 at comparis.ch whereas the same costs around CHF2000-CHF2500 at homegate.ch.. Would appreciate if anyone could point me the correct range.. Great thanks in advance..