"At this point, I think both companies can do well, but as far as the stocks go, Stratasys would be the one to own," said Cramer.
Why? Unlike 3D Systems, Stratasys appears to have a new catalyst.
"Just last week this company closed on its merger with Objet, which is another 3-D printing play. More specifically, Objet has the leading technology, the best margins, and the fastest growth in the industry, with a pristine balance sheet," Cramer explained.
"With this deal, Stratasys gets access to a broader customer base, and Objet's technology, which is complementary rather than cannibalizing their existing business."
Also the Objet merger gives Stratasys more exposure to the high-end.
"For example, there's a ton of interest in the new Objet 1000, a 3-D printer that's priced at $600,000, and not only that, it costs forty grand just to load the machine with materials. Now that Stratasys owns this baby, it should give a big boost to the company's growth rate, as well as its margins."
Read More: Stratasys and Objet Complete Merger
That's not to say 3-D Systems doesn't belong on your radar. "It's an excellent company," said Cramer.
"I just think the stock is too expensive right here, and you have a better opportunity in Stratasys, which is not only cheaper, it also has the advantage of all the positives from the Objet merger."
What's the bottom line?
"I think the 3D business is for real, not some flash-in-the pan," Cramer said, "and Stratasys is the way to play it. But remember, wait for a pullback before you start buying this one, and please, please use limit orders."