FCC vs CENELEC-B band for IoT application using PLC
The CENELEC-B will allow the signal to transmit further but there is greater noise interference due to this property. 

With more research, I have found that the frequency band 150KHz up has regulation to keep noise from PSU (SMPS) as low as possible in order to pass EMC testing. but in the CENELEC-B band, there are no such regulations as that is were SMPS are gently active (between 9k to 100K). 

Therefore I have chosen the FCC band, even tho the signal propagation will not be as far.