American & English papers work well together. Right now the cost of English papers (especially in the wider widths) is higher due to value of the dollar (down) overseas and increased shipping costs. The weight of the English papers is pretty consistent (with the exception of the heavier dark colors) Depending on which American papers you use weight can vary from color to color, again with darker colors being somewhat heavier. English strips and Paplin Product strips come in the 4 standard widths 1/16", 1/8", ¼" & 3/8". Most Lake City papers come in all four widths although some of their colors are not available in 1/16". Quilled Creations strips come in 1/8', ¼", and 3/8".
In the 1970's, 24" was the standard length for American quilling strips. That is no longer the case. Lake City papers are 24' long with the exception of their new watercolors, which are 12". Paplin papers, another American paper, are generally 23" long. Quilled creations papers (American) are about 18" long, their graduated papers are about 12" long. English papers are 17" long with their graduated and dark centers 12" long.
When I brought English papers into my inventory they came in a much larger variety of colors than American papers, including some of the dark "jewel tones" like navy, hunter green, royal purple etc. Now many of those colors are available here in the states (mainly Paplin papers which are actually a nicer working weight than the English dark colors) I have been told that the heavier weight has something to do with being able to take the darker dye, although the Paplin black is a nice easy weight to work with. The English also have some wonderful novelty papers, graduated strips where the color darkens as it goes up the strip, dark center strips, two toned strips (one color on one side of the paper, a different color on the other side), fluorescent colors, ultra white, pearlized edged papers, gold & silver edges. Not to be out done Paplin Products and Lake City have come out with lines of pearlized and metallic papers (not just on edge all the way through). Paper weights can vary, specialty papers, like parchment, tend to be a lighter weight. Some of the "quilling" paper sold in scrapbooking stores, (especially the tube paper sold as "quillstix") is very heavy, almost as heavy as cardstock. Unfortunately, some members of the scrapbooking community are saying this is the only weight that will hold up in a scrapbook. Those of us who have been quilling for a while know that this is not accurate. Regular quilling paper is incredibly strong when rolled and placed on edge.
Since we carry so many different kinds of papers here at Whimsiquills, I have tried them all. I don't like working with the heavy "card stock" like papers, and find them difficult to finger roll without getting unwanted creases. If I have to roll a heavier paper, I generally use a tool to keep tension even.
All of the choices now available can cause some confusion for new quillers. I find that all of the papers can work pretty well together if you are just careful to measure the strips you cut from the different brands. For example: if you are using an English yellow for the center of a flower, but an American orchid for the petals, you will want to start out with the same length strips. If you are using the English navy blue (which is a heavier weight), you will either have to make the strip a little shorter to compensate for the larger size center, or perhaps make a couple of extra petals for your flower.