If you are storing guns in a safe and unless you simply can not wire to AC there is no reason to go with anything but a Golden Rod. I paid $20-30.00 for my first one approx 20 something years ago. I have yet to have one issue with rust pitting or corrosion of any type. Not even on the few abuse use guns it shares safe space with. It(Golden Rod)spent the first 15 years in a non fire/heat rated Browning Platinum Plus Series 24 +/- gun safe in the heat & humidity of my west central FL. homes non climate/humidity controlled garage. Several guns in that safe laid where they were first placed for 10-12 years and even those never showed any finish action or bore issues. For what it is worth, I always cleaned lubed and oiled anything that had done work and or was going to get a rest for a while. Even now with two additional fire/heat rated Liberty safes which reside in a climate/humidity control environment at my U Store It type man cave I still use Golden Rods in all three. That is just my experience, others may vary.
Beer is good, God is great, but as long as there are fish to catch heaven can wait.