Which do you prefer?

If you want to save some money on inks then it is highly recommended not to buy ink refills.
This is probably ok for printers with ink nozzles that are not built into the cartridge, like Canon printers. Still, you must be careful. The ink may not be the same quality as what you would get from the manufacturer.
If you are using an HP printer, the ink nozzle is built into the printer cartridge and is not meant to be run refill after refill.
When you replace your ink cartridge, you also replace your old nozzle with a brand new one. This helps keep the print quality good. Especially so if you are trying to print out photographs.
Another factor to consider is that when you bought your printer, you were probably looking at print quality. Why take the chance on compromising that print quality to save a few bucks?
Those budget inks you can get are not that great either. Usually they are made with recycled ink.
It is still best to opt for the factory stuff or a decent generic from your local office supply.
Which do you prefer anyway? Save a little money or good quality prints and longer printer life?