It’s quite funny that this question is still coming in 2018. Anyway, welcome to the Laserdisc community!
HDL X9 and X0 are indisputably the best players in the world, but also the most expensive. But there is no comparison in terms of quality: they are the best players.
DVL models are not good players, I would not recommend them. Their only interest was to have a DVD player coupled to the LD, but at the expense of the overall quality of the image.
For what purpose do you look for an LD player? To view records in your living room? to connect to a projector? To capture old LDs and encode them numerically? Only NTSC or PAL? To connect them to a video card, or to a video upscaler? What is your budget?
Depending on the needs, some models will be more recommendable than others…