I'd much rather go DL. Our OL might not be ideal, but we have much more serious issues at DL. We have to have the mindset that Ratliff will not play this season. Are you really confident in Hayden/Bass/Cohen? At least on OL, if a tackle gets hurt, Free can fill in and Bernadeau can play RG. Bernadeau can also play LG if Leary gets hurt. And if Frederick gets hurt, Costa comes in.
The bottom line is, we can survive with our starting OL as is. We can even withstand a few injuries. But we can barely survive with our DTs as is. God forbid one of them gets hurt...