If you're going to dedicate a nailer to engineered lumber, especially at a nailing station and cost is no object, then the Hitachi is the one for you. They're both reasonably priced, basic power punchers that'll sink nails and won't slow you down. I typically choose the lightest tool I can find. Call me lazy, but I just don't like lugging around any more weight than I have to. The Hitachi, Interchange, Makita, Senco, and Spotnails nailers are heavyweights that absorb a lot of shock.
Severe recoil makes nailing more tiring and dangerous.
If your tool tries to jump out of your hand each time you fire, your nail placement might not be accurate. The Hitachi weighs in at a beefy 9 pounds, and it's got the softest recoil of any tool in our test group. The Grex nailer is the exception to this rule. It has plenty of weight, but it didn't consistently sink the nails. When the nail drives only partially into the material and stops its forward motion, the remaining power comes back at you in the form of recoil.