I don't have any experience with a face wound, but my whippet has had the top of his head stapled twice. Gave him a valium, a couple shots of local and bang, bang, bang. He was good to go. With staples, you need to return to have them removed. I had another dog with staples in the front of his leg, healed great, no scar. He didn't even get a local, it was so fast. (Not my call, but the evet) Maybe it depends on the type of wound. Both dogs had flap tears, not chunks missing.
Hope he heals fine!