Which is better? Positive pcb or negative? I'm using the toner transfer method
The question of using positive or negative photo resist (not PCB) is not an actual option when you use toner transfer, as you just need a thoroughly cleaned copper laminate.
Photo resist is used when you make PCB's with a film and UV light and while negative resist can be hard to come by for the hobbyist, it has a clear advantage over the positive types, as it's easier to avoid pinholes and hairline cracks in the traces.