Laser printers are still the best option for primarily text and straight lines. They have a cleaner, crisper look to documents without as many gradients and little details. I suspect this won't be as important for most home printers, where variety and image quality matter more than perfect serifs. Where color laser printers I tested ran about three or four seconds per page in black and white, the EcoTank was more like six per page, right in line with full color ink cartridge printers.
OEM toner cartridges are made by the printer brand itself (e.g., Canon, HP, Brother). They're reliable and usually hassle-free, but they cost more.