All art and audio is interchangable, yeah. It's all PNG and OGG files for the most part (it accepts MP3s as well, but Enterbrain uses OGG for the looping features), so it's just a matter of importing it (or literally dragging and dropping stuff in windows explorer into the relevant folder). Some of the older art may need some minor resizing as MV is more designed for modern resolutions than VX Ace.
RPG Maker MV is nice and has a lot of QoL improvements over VX Ace. Less slow down, more options for resolution changing, better character and map generator and the like. But I'd definitely go with VX Ace for now, just because of the price and the fact that it has 5+ years of support, tutorials, resources, scripts and so on. MV simply doesn't have the same level of support yet due to being newer.
Older makers? Not really, unless you have nostalgia for them or are big into the exact way their toolsets work. I guess the default audio stuff there might be worth it alone, if it were cheap enough. But they put those out as later asset packs too, I think. Grognards like them because they know them inside and out over almost 20 years.
EDIT: OH! VX Ace does not have native side-view battle support, I believe. But you can use scripts to replicate it if the old Dragon Quest first person thing is a huge no-no.