Would be worthwhile to read some of the reviews on each of the sets, but - fwiw - consensus is that the ST30 series provides a much better PQ than the S30.
OTOH, have seen some remarkably cheap prices on the S30 / S34 (Costco), so if pricing is a major consideration....
OTOH, have seen some remarkably cheap prices on the S30 / S34 (Costco), so if pricing is a major consideration....