Hi,
- A: one is with 80 GB SSD (and 12 GB memory)
http://www.ovh.co.uk/products/eg_ssd.xml
- B: the other with 750 GB SATA2 (and 8 GB memory).
The Intel SSD are fast but have a history of firmware problems. So I wouldn't suggest using them on a mission critical data. Personally I think asking for more RAM on the SATA server would do more for performance especially since you are going to be running several VM.
Just my noobish 2 cents' worth.