The duo are fighting for one place in boss Steve Clarke's team when the Baggies kick off their Premier League season against Southampton at The Hawthorns next Saturday.
"Billy's been superb in the last two seasons," Reid told the Express & Star. "I would have liked to have played a lot more games last season but at times there is a place for Billy's attacking threat.
"There is a time for myself to play because you will come up against teams where you need more height and not as much of an attacking threat.
"So I think we complement each other and I am realistic enough to know I'm not going to play every game in a league season and hopefully me and Billy can both get our games in."
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