[RickB]

Well, it's a consideration you have to make. Hosters using "Pure SSD", as you call it, most of the time have quite low storage, because SSD storage is quite expensive. The speed of SSDs is a little higher, but if you write small files, you should also be fine with a SSD-Cached. Simply because small files will be written into the SSD-part first, before written to the HDD-part. If you want more storage, go with SSD-Cached, if you simply want the highest performance possible, you should go with "Pure SSD".

Another thing you should keep in mind: Although the speeds of SSDs itself are higher, an SAN or a NAS could reasonably lower the actual speed. Lots of hosters use a SAN as a central storage for all servers.