Rental comparison sites for market rate rent

Hello BP community,

I have a lease due for renewal in two months. The current tenant signed a two year lease and I did not raise rent during this period.
I will raise rent to market rate once the current lease expires. 

I am basing what I think market rate is on research from sites like Rentometer and apartments.com.

Are these sites accurate enough or are there any other sites I could use as well? 

I appreciate any feedback. 

Thank you