What are the difference between web fed and sheet fed?

For medium to long print runs - 50,000 copies and more - a more economical choice is the web press. This type of press uses large, continuous rolls of paper rather than individual sheets. The rolls are fed through the press at high speed, making printing fast and efficient. In fact, web presses can process 40,000 images per hour, as compared to the 10,000 per hour of a sheetfed press.

While with sheetfed presses, all binding takes place off the press, with web presses the paper is trimmed to the correct size and folded while still on press. This automated folding capability offers dramatic savings. Today's web press output also rival the quality of sheetfed presses.

I've printed magazines for years and if you looking for a good printer, please check out heidel print. They can print with either web-fed or sheet-fed and both are very good quality with reasonable price.