SSD should be better of course. SSD has better Disk I/O Speed & ioping. I have no idea about the provider you mentioned. You better search for their reviews & take final decision.
SSD (Solid State Drive) can transfer (read/write) data 20x faster than HDD. So a SSD VPS will be a better one. Try SSD VPS Hosting by EzzyTech Networks
SSD is the only option i would go for, its faster, better and more reliable. So no doubt SSD is better