USB 3.0 Unnecessary?

i have most of my libraries on an external hard drive for use by my home studio 7xl.  that hard drive is usb 3.0 capable, so i bought a card to utilize usb 3.0.
 
here are the results of my usb 3.0 trial:

usb 3.0 is about 40% faster when reading from the external drive and writing on my internal drive (36 Mb/s with usb 3.0, 26 Mb/s with usb 2.0), but is 3 times faster when testing with HD Tach, which is a sequential read test, tho that speed may not be applicable to what i'm doing.

when i use the usb 2.0, i still get the following, for a project that has 15 midi tracks with alot of automation (EWQL SO, dimension pro, kontakt 4, etc; my RAM keeps me from adding more tracks on this project):

1) projects load essentially at the same speed for both
2) the projects play without drop out
3) exporting the audio from all tracks is similar using both.

if i have the success as listed above with a usb 2.0 external drive connection, does that mean i don't need usb 3.0 speed? or is there some scenario i have not considered when slightly more speed would make a difference.

thanks.

Here's something I saved that talks about USB 2, but I'm pretty sure it still applies for USB 3 (except that USB 3 is simply faster).  It should explain why the Firewire results are still favorable at times though.

FireWire vs. USB 2.0

Question: Which is faster Hi-Speed USB 2.0 or FireWire?
Answer: In sustained throughput FireWire is faster than USB 2.0.

• FireWire, uses a "Peer-to-Peer" architecture in which the peripherals are intelligent and can negotiate bus conflicts to determine which device can best control a data transfer
   
• Hi-Speed USB 2.0 uses a "Master-Slave" architecture in which the computer handles all arbitration functions and dictates data flow to, from and between the attached peripherals (adding additional system overhead and resulting in slower data flow control)

• 5000 files (300 MB total) FireWire was 33% faster than USB 2.0
• 160 files (650MB total) FireWire was 70% faster than USB 2.0

• 5000 files (300 MB total) FireWire was 16% faster than USB 2.0
• 160 files (650MB total) FireWire was 48% faster than USB 2.0

Now THAT'S funny!  I had the above sent to me in an email - good to know it originated from such a quality website!

You should check out the article on USB 3.0 Vs Light Peak, Intels new interface. There is a reason the industry has been holding off on USB 3 for awhile... They're all waiting to see what Intel releases!

New Macbooks released today have Lightpeak which is now called Thunderbolt. So it's now out there.

I think we're going to see great things with lightpeak! :D Super excited!