The Yaesu 857 / 897 are basically the same radio inside, although the 897 being larger is a bit easier to operate, and also has internal battery and matching power supply options if you want to go that route. You can only do one at a time however. Fortunately, the switching supply for the 897 was very rf quiet.
Both have the Collins mechanical filter options for ssb and cw. While some say they don't make a difference, I feel that they do, and switching between the stock and collins mechanical filters is very noticeable when chasing dx. Of course, this increases the overall purchase price.
Out of the box, the audio is wide-open and has led some to believe that the audio is lacking. One should do two things in the menu structure:
First:
DBF - turn this bandpass filter on! I normally leave it engaged all the time.
Second:
Go into the menu structure, and set your audio lowpass and highpass frequencies. 220 for the low, and 2450 hz for the highpass is a nice start. Note that if you forget to enable DBF, then when you make adjustments here, you won't notice any difference. Did I mention to turn DBF on?
When I got these radios and was perusing the manuals, before I got to these sections I thought I had a bad radio - nope - it was just that the audio was wide open hi-fi, which isn't needed for typical ssb/cw comms.
This is easy to overlook, and if you see your typical comparison videos of these radios sounding bad, take a look to see if >DBF is engaged, and of course the internal speakers are always utility-grade. Invest in a quality speaker and/or headphones like the Yaesu YH-77 cans which have 35 ohm impedance which mates up nicely to the audio sections on both radios.