I see most people use composite out instead of the S-VHS can i ask wy?

If i use the composite on my pioneer kuro then the colours starts to bleed and colours are moving

If i use the S-VHS is crystal clear. i know this is tv type different.

The argument is that laserdisc video is recorded in composite domain. So when composite out is used, in theory, you are using native composite signal. On s-video, composite signal is split into black&white and color by a device called y/c splitter aka. comb filter in most cases. If your tv has a better y/c splitter than your laserdisc player, you should get better results with using composite out. Given the newest laserdisc pkayer is about 12 years old, it is safe to assume modern tvs have better y/c splitters.
In practice you may find this not true. Most late laserdisc players split b&w and color internaly then apply noise reduction,sharpness,time base correction etc.. then combine color and b&w inti composite. So you dont get as pure signal as you hoped. In fact the inferior y/c splitter already did the damage. So when you use composite, you are using already combed and combined signal.
Some says when identical y/c splitters used, you should get identical signal once splitted and combined again. Some says the signal is no where near pure anymore.
There is one or two very expensive exotic japanese pkayers that dont apply the above process. Pioneer kuro tvs have arguably the best y/c splitter you will find in a modern display. It is possible your tv is doing too much processing in compisite. Check advance menu. Make sure you disable all enhacements.

I often wonder about this as well.

What sort of comb filters do modern HD televisions have? It seems to me most video technology is now geared towards digital (HDMI) signals, and any composite inputs are merely included as a courtesy nowadays.

I have found that when making digital copies of laserdiscs (using a laptop) I can get a much better image with the s-video output than I can using composite. The filters built into the CLD-2950 do a far better job than the capture devices I am using.

Comb filter in ld pkayer is synced with the laser. All eu and us players are 2d and 2d adaptive. Cld99 is the only player with 3d comb filter. There is a bunch of japan only players with 3d filters.
Almost all electronics today use 3d comb filters. Almost all of them are none adaptive and no user adjustments.
You have to understand how 3d comb filter works. 3d comb is only usefull on static images and static parts of the image. Adaptive comb filters default back to 2d when motion is detected. Adjustable comb filters on ld pkayers let you select how aggressive the player should engage 3d filtering.
So most cases a 2d filter do a better job than a poor 3d filter. 3d filter on my crystalio 2 video processor allow me to select how much 3d filtering should it apply. Threshold setting allow me to set what should be considered video grain(static) an

All 3D comb filters are adaptive or they wouldn't work the majority of the time. That's the whole point in having a 3D comb filter. Some NTSC signals simply cannot be separated so adaptation to 2D or notch filtering is required. Just because a manufacturer doesn't call it an adaptive 3D comb doesn't mean it isn't adaptive.

I have an EAD TheaterVision player which is based on the Pioneer Elite CLD-99 and adjusting the comb is interesting - at full 3D setting the image ghosting is really bad with certain discs - a few clicks above 'standard' seems to work best on most titles. The wide color bandwidth of the 3D filter is wonderful - I've never seen the color resolution bars on the Video Essentials Zone Plate pattern so bright and sharp with no artifacts. The 3-line Logical comb in the LX-900 gives as wide bandwidth but not as bright and sharp and with dots and other artifacts. The 3D adaptive filter in my TV gives excellent performance too but can't be adjusted and the composite in overscans about 5%.

IMHO there is no such thing as "the best way" to watch laserdiscs or any format that is....
Equipment , brands etc. can make the difference .
it's a combination of all technology together I guess...

My ultimate picture may be a huge letdown for others. It's a personal thing.
There are always guidelines to keep in mind but the bottom line is enjoying the format along with it's limitations.
We're so spoiled with HD nowadays making it tempting to pursuit the ultimate PQ when it comes to Laserdisc.
LD pq can be very good, even great but better than modern technology. NO way!

Enjoy the format regardless whatever connection you use. I like the fact there's no HDCP involved

that's kinda interesting, seeing as the kuro have a sweet 3d y/c with variable strength. My kuro doesn't actually have svideo (which is kinda weird), so i have to use composite with my x9, if you use svideo on yours, the kuro's y/c will be disabled. now i really wonder what the x9 would look like with a svideo connection. I have been thinking of trying to connect the svideo through component, as there are often solutions where that is possible.

On my Kuro 500A I use a S-Video to Scart connector with my X9.
Of course you have to set the desired input into S-Video mode, too.
And I think that is only possible on one or two of the inputs.

yes, the 500a have scart, but the 500m doesn't :/ but i find the image of composite on that TV very nice =)