Denon's are pretty reliable. I must have half a dozen in my house....

A couple of years ago I upgraded all my displays in the house to 4K. In my great room, I still use external amps, so I wanted pre-outs, plus 4K video pass-through. Bought a Denon X3500. It's nothing spectacular but has worked without any issues to date. I suspect the 3700 is a similar, but updated version of the 3500. I'd go with that rec, if it were me....