It never pays to go cheap, go oem because in most cases you will have to replace the aftermarket one within 6 months to one year if your lucky with no warranty.
The oem should be cover under warranty only if install by a dealer
I work at a dealer and I see it all the time, customer just replaced his fuel pump and now his 10 amp fuse keeps blowing but the customer insist the problem is not the new pump lol