If Bernie & Edgar were both Yankees, I don't think this vote would even be close. If Bernie were a Mariner and Edgar a Yankee, the discussion would never even have come up.
There is no way of looking at the offense that would say that Bernie was very close to Edgar.
I'm not much of a fan of defensive WAR, and I'm probably misunderstanding a little, but if you look at Edgar's career dWAR (according to baseball-reference) it is -9.7. Most of that came in years where he was almost exclusively or exclusively a DH, so I think the calculation assigns a player a (-) value for being a DH (which is fair, when looking at overall value). In fact, he had a positive dWAR in a number of yearsin which he played 3B (probably only M's fans... and even few of those... remember that he was actually a very good 3B before his leg injuries no longer allowed him to play the position regularly.
Bernie's career dWAR was -10.3... that would indicate he was not an above average, but a below average CF. I know he won some GG's, but those are a popularity contest, often... I mean, ****, Jeter has GG's and he is a ******* terrible SS (just makes some very high profile, exciting plays)... and he is not the only ridiculous GG winner.
Ultimately, I would take Edgar and Mike Cameron (just using as an example... there are plenty of lesser CF's I could plug in) over Bernie and any of the DH's the M's have had since Edgar by a ******* mile.... Edgar would be and was just FAR more difficult to replace than Bernie (far more likeable as well, but only Mariner fans would probably know that)