what is the difference between kits with grape skins and just juice.
First very few kits are all juice. Most are juice and concentrate. Some kits have a bag of grape skins that you add to the kit.
i bought a 10 l juice kit. .. . do the 16l kits have skins in them and are they better....
some and most. But a 16 litre kit from some companies may not be as good as a 10 litre kit from other companies. Also it depends on your taste buds. You may not like the taste of a specific 16 litre merlot kit compared to a specific 10 litre Merlot kit.
There are two things to consider taste and quality. For example, I do not particularly like Chardonnay. So I will prefer a lesser quality Riesling or Gewurztraminer to the best quality Chardonnay.
FYI, I mostly make 16 litre kits (like Ken Ridge Showcase, Cru Select, Selection), but also make some 10 litre kits (Ken Ridge Classic). I'm not too familiar with Cellar Craft product but here good things about their Showcase 16-litres and 12 litres (both with grape skins).
BTW, I don't make a lot of grape skin kits. Require a lot of aging and some extra work (although I have the tools/experience to handle it). I don't recommend rookes do grape skin kits. They are likely to have racking and patience problems.
Steve