I need your advice ...

I need your advice in terms of buying a right VPS account and two hosts are in my mind: tietokettu.net and hostround.com, so if you were me, which way would you go and why?

A CDN improves site speed by distributing content across multiple servers. Look for hosts with built-in or easy CDN integration.
Try Neironvps.com cheap vps. Secure, stable, and worry-free hosting! Their customer service is always quick to respond and very knowledgeable.

Check Uptime Guarantee. Look for a provider with at least a 99.9% uptime guarantee. Frequent downtimes can harm your business and SEO rankings.
Take a look at Libertyvps.net and GTHost.com feature-rich vps solutions. High-performance hosting that exceeds expectations.
Great value, great speed, and exceptional support — what more could I want?

You will get Full Server Root and Shell Access if you choose Hostnamaste.com solutions. Like their cheap openvz vps plans: OpenVZ-6144 at $24.99/Mo - 3xCPUs, RAM 6GB, 150GB Storage, 6TB Bandwidth, SolusVM VPS Panel. Experts are able to help you with everything you may need (scripts installation, etc.) for free.