RS-422

I am implementing RS422 first time in my design. I was using RS-485 till now but one of my new design need the Rs 422 Communication. I used part SN75176 for RS485 and i know i can use it for RS422 if i use it separate for driver and receiver. But My board size is bit smaller and i am afraid that i can use that ic in 2 number. I have been through your website and find two part SN75179 and uA9638C. which is appropriate for me i am confused in the selection between them.