Tough choice - the Bengals are throwing a ton right now, but there are two other quality WRs for the Bengals...I still think he'll get around 8 touches even against a good secondary.
Evans seems to be the only reliable BUF WR, but Losman has been so inconsistent. I still like him against a terrible secondary like JAX.
I don't think you can go wrong, but I'm starting both, so I can't really choose.