RAID 0 takes the speed of one drive and the speed of the second drive and nearly doubles the speed. So yes running faster is better
Except it sometimes isn’t. One issue is human perception of time. Instant is instant. If you shave a 3/16th of a second off something that takes 1/4 second it’s a massive improvement clock wise, but a near zero improvement perception wise. The other problem is by nearly quadrupling speed you increase fragility by x8 (2x2x2). There might be a reason to do it if those 3/16ths of a second become critically important. Currently they just aren’t for gaming though.