I've never been big on hooking over forks due to the risk of slipping off. Also not thrilled about the hooks on the bucket since it limits you to a chain (risk of damage depending what you are lifting, and the chains most people use technically aren't rated for lifting)
On my loader buckets I have a couple of holes drilled (or torch) into the bucket. One in the middle of the cutting edge, and a couple along the top edge of the bucket. Easy to shackle through, and attach chains, wire rope, or synthetic slings as required.
On my forks (large off-road lumberyard style forklift rather than a loader attachment) I have a 1" hole cut in the tip of each fork with a mag-drill. I keep a pair of 1" shoulder rigging eye bolts along with nuts, washers, and a crescent wrench in the cab. You can use single or both as required, and there is no chance of slipping off the forks.
I've seen enough things be dropped by slings slipping off the forks. I'd rather not hurt someone, damage an expensive part, or drop something on a customers truck when it is so cheap and easy to use a much safer setup.
Also it is worth keeping a few synthetic round slings on hand. The 4' by 3000# rated ones are between $10 and $20 depending where you buy, and you will find yourself using them constantly once you have them. They choke tightly even to slippery parts, yet will not scratch or dent even polished items.