Not enough experience here to vote. I just remember when I did my research, I thought Valbazen was the way to go if I had to worm my flock. Do they both kill ALL chicken worms? If so, maybe it doesn’t matter much. Is Valbazen the more expensivekne? I think Safeguard might not take care of roundworm, in which case you woukd treat with Wazine, too, I think. PLEASE NOTE, I’M GOING OFF MEMORY AND COULD BE WRONG. There are others with lots of worm experience here who can chime in. My flock ended up testing negative for worms, so I didn’t end up worming then. Lately I think they’re eating lots of earthworms, though, as a couple have especially dark poops after free range time, so I may need to. Earthworms can carry chicken worms, but I forget which ones. Tape worms maybe?