I'd still bag the carabiner. But if it floats your boat I'd use a simple bowline in either case. I've never had to tape or stitch the tag end of a properly tied bowline, which is very secure under load and still easy enough to untie if necessary. IMO, I think a DB anchor picks up better with out the additional hinge point of a snap lock. One less thing to snag up too.

BTW, old snow chains make a good anchor if you don't plan on anchoring in heavy flows.