I have both. My opinions are non-audiophile in nature. I like the 604-8G for jazz and small classical or the occasional folk album. The 19's are my everyday players because they can do jazz but also shine on metal and classic rock. Neither do low bass or extended high frequencies so they won't be a good choice if you listen to techno or synth music. I have fairly eclectic tastes and a relatively large collection of music of varying styles and both speakers can work well within their limitations. If you want to party, the 19's are the answer. If you want to engage with the performers, the 604's are a better choice. I've had both in rooms varying from tiny to moderate in size (10 x 12 to 14 x 25) and I think they will both play well in these types of spaces. They could be better in a larger setting but it shouldn't turn you off just because your room isn't ideal. Do some room treatments and enjoy the sound.