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Not so much a different class since they both process data in the same manner but different application as well as different controllers and one seeing more channels. USB Flash Drive Versus SSD: Solid State Drives Vs. USB Flash Drives | Premium USB Blog
Most 256gb SSDs run over $200 while 240gb models are priced under $200. They weren't that cheap a few years back when vendor suddenly started stocking up on the newer models.
The large capacity flash drives you can take along with you everywhere seem to end up seeing the higher prices remain on the larger models. You are paying for "convenience" not performance since flash drives are not glued to one machine only. PROVANTAGE: Kingston Technology DTHX30/256GB 256GB Datatraveler HyperX 3.0
The article there didn't reflect the current pricing on either.