There is no such thing though as "regular" vitamins. A gummy is a candied form of a chewable vitamin, which some families found kids would take when they wouldn't swallow pills easily. All chewables usually had sugar added and gummies are even worse, as they stick to your teeth. But the real issue is deeper, as many pills also have artificial ingredients, which I take it you mean fillers and binders that may not be good for you. Some tablets and capsules, especially if you buy drugstore vitamins or discount vitamins, have forms of sugar in them also. Frankly, sometimes it's hard to buy even the best vitamins without some kind of sugar in them, as some are used as binders, such as maltodextrin. But there is certainly a lot less of it if it's just to bind the pill than in a chewable or a gummy. And then there's the content of the supplement aside from the additives -- most drugstore brands don't have the right form of vitamins and minerals for the body to have the best chance of absorbing them. Some use forms that are cheap but useless. Or harmful. So it's more than just the additives. It's also the vitamins and minerals themselves. Always buy from the best health food stores and buy the most expensive product on the shelf if you don't know your brands, or if you still have a small health food store (and I don't mean a GNC or the like) that isn't a chain store, ask the supplement buyer which current brands their customers seem to like. If it's really cheap, it's probably cheap for a reason. If it's a mineral and it's a very small pill, know there's either not enough in it given we don't absorb isolated supplements nearly as well as we do food or it's a form that won't help you any. Some companies really go an extra mile to try to get absorption, such as fermenting or culturing the nutrients so they are turned back into something more like what it would look like if still in food. But yeah, don't bother with gummies, they're just candy.
I agree with everything Paxiled has said - with the possible exception being the recommendation to buy the most expensive brand in the store. It's true that, basically, you will get what you pay for, the most expensive isn't always the best - look at the price of some of those gummies, for example.
I look for supplements that have the least ingredients, with the actual supplement being among the most prevalent ingredients. Also, look for those that are in a form in which the body can readily use. It's true that taking only one of most supplements/day isn't going to be enough, but you should also not try to take the entire dosage (say, 1200 mg calcium) all in one dose, because the body can't absorb that much all at once... Again - calcium is a good example - the body can only absorb approximately 600 mg at one time, so split the dosage to accommodate that.
All of that said - it's best to try to get your vitamins/minerals from your food, over the course of the day, whenever possible.