Even though both say high trajectory I think that the Rocket Bladez have slightly better stopping power than the Speed Blades.So their trajectory may be slightly higher.
You might also want to learn how to Spell Bladez. It took me a few minutes to decipher what you were trying to say.
If you are considering getting a new iron set you might want to consider waiting until level 90 and get the Taylor Made RSI 2 irons. They cost more but are much better than either of the other 2 sets. More distance on most of the irons, same precision, more forgiveness, same meter speed but what makes them a better choice it the great stopping power due to the higher spin.