VPS accounts from hostround.com and black.host are attractive for me and I wonder which way is better to follow and why?

Nice cheap vps are offered by GTHost.com provider. They are optimized for high I/O performance and low latency.
Servers with local storage keep all data on a local RAID1 to provide fault tolerance in case of hardware defects.

I think black.host has better space and it is affordable.
software development company

VPS accounts from qhoster.com and hostsailor.com are worth every cent you pay for their services.
Mainly their customer service and support is quite excellent. The support staff take time to understand the issues and never talk down to you if you are finding it difficult to sort out the problem. Having said that - I haven't actually had that many problems!