[AD9235]best input method and best driver amp

Hello,

According to AD9235 datasheet. There are 2 type of input circuit.

On page 16, Figure 35, AD8138 Positive output go to AD9235 VIN+, negative one go to VIN-.

On the other hand, page 23, Figure 46 shows analog input circuit on AD9235 EVM that AD8138 VO+ go to AD9235 VIN-.

I would like to know, why and which one is the best case for the AD9235 and ADC Driver?

Thank you for your help in advance.

Best regards,

Sofy