Transcend is the slowest pen-drive i have ever seen, next is iball super duper ultra light weight.
Man i have a ZION 1gb pendrive using it for around 2yrs, and found no other drive to beat it reagarding speed. I haven't used kingstone though, hope it will be faster than my zion.
I have tested 700mb file in realtime and recorded the time on a stop watch.
Transfer time taken single 700mb avi file:
1gb Transcend = 3 m 43 sec
1gb Iball = 3 m 28 sec
1gb Zion = 1 m 1 sec
Transfer time taken Visual Basic 6 cd contents(600mb aprox):
1gb Transcend = 28 m 31 sec
1gb Iball = 24 m 9 sec
1gb Zion = 6 m 45 sec
Clearly here Zion wins, As Zion is not available i think Kingston is the better choice.