primaluna is all tube unit whereas vincent is tube preamp stage then solid state ampification stage
thus PL will sound more romantic, softer/sweeter treble, have better imaging
vincent will have more powerful leaner sound, more shimmer and sizzle on top, more solid bass, image will be a little smaller, more shallow
which is better depends on what kind of music you like and what type of sound you prefer (leaner more solid with harder edge or softer focus more fullness around voices)
thus PL will sound more romantic, softer/sweeter treble, have better imaging
vincent will have more powerful leaner sound, more shimmer and sizzle on top, more solid bass, image will be a little smaller, more shallow
which is better depends on what kind of music you like and what type of sound you prefer (leaner more solid with harder edge or softer focus more fullness around voices)