Neither is a good investment. That said, if you hoping to buy a putter that will not lose value, the better collectible is the Scottsdale. There is a limited supply in decent condition and they will never be avail in their original form again. Scotty's are great, but they roll out a new batch of 009s every week with no end in sight.
Like any collectible, it's all about the price you buy it for. If you in patient with either of these and snatch up the first thing you see, you'll probably lose money. If you study the market and patiently wait until you know what a good deal looks like you can do alright with either.