The press with the wood is cheaper, becauese it does not require a lot of metal which is quite expansive. I think you won't see a difference in final result.
The "wooden press" costed me about 100 - 120 euro. If I would have to buy the metal for the "metal press" it would cost me about 200 euro. But maybe the steel prices are different where you are living.
zachjowi,
if you buy your steel new and from a steel supplier they will price according to the marked. Buying from a retailer will contain its markup.
In most metropolitan areas with a thriving steel market, new steel is around 58 cents per pound. Scrap is down around 30 cents per pound--prices can change daily according to global markets.
If you have resale and steel scrap dealers take a look a their prices.
The steel you want is not 'scrap' but you don't need to use brand new product.
If you know the value that scrap is going for and the average price new in your area, you can't go wrong spotting a deal.
Unfortnatetly, lumber prices are a very local thing when speaking retail.