Comparing VPS plans from kvchosting.net and hostsailor.com, which way is better to follow? 

Very very good hosting. Kvchosting.net is everything a host should be - it's there, it works, it's supported, and is extremely professional.
The customer service is prompt and will get you the information you need to make your website function the best.

When selecting a VPS account, consider your specific needs. Evaluate the provider's reliability and uptime guarantee to ensure consistent service. Assess the resources offered, including RAM, storage, and CPU, to match your website's demands. Look for scalable options that allow you to upgrade as your site grows. Check for customer support quality, such as 24/7 availability and responsive assistance, to address any issues promptly. Finally, review user reviews and reputation to gauge the provider's track record in delivering a secure and efficient VPS hosting experience.