latency is not determined by the software, its all in the asio soundcard
features and fx! what effects that are software side are you using when mixing? you are using timecode and not midi ?
lol at serato being mainly focused around the scratch dj, scratching is done by crabbing your xfader and manipulating the turntable, nothing to do with any software
you dont need to explain each one to me, i have used them all, i dont regularly use any of them, i dont need a DVS, my denons play mp3/wav direct from usb storage, this is far better than any software btw
traktor is not more polished, serato is not more polished, vdj is not more polished, they are all digital vinyl solutions, they just have a different skin, with different ways of managing your 'crates', they are all basically the same thing, a timecode signal transmitted to an asio soundcard and equated to an mp3 track, unless you are not using timecode with these softwares, then just lol
if you like to think you can justify your huge outlay for a nicer GUI and think that makes it better, then ok, if thats what you wanted to pay for, but the NI soundcard does nothing extra an m-audio etc can do. all you need is a 4 in 4 out asio soundcard for DVS, vdj lets you use any, serato and traktor want you to use theirs and block all others, simply so they can whack a premium price tag on their product, end of story mate, its just business