I get my wire from Oxford welding supplies on eBay good price never been sold any bad wire, not cheapest but well priced gives consistent welds, not to much spatter, I've tried the new lidls wires - good for price will get you out of a spot. I have three different fluxcore + one mig the mig obviously gives prettier welds, are they stronger ? I don't know, personal experience is flux core penetrates deeper. I've found different people have different experiences with different wires. Once you found one that works good for you stick with it is all I can say