SYS (So you Start and Kimsufi) are both sisters from OVH (3rd biggest world hosting company) .
Very reputable companies, but if you don't know how to manage a server is better you also hire a sys admin to help you prepare your servers.
If you need a server for business i recommend you go with OVH directly.
Agree with FloXera. You can sing-up with any of the best web hosting provider. If you do not have the server management knowledge then you can hire the server administrator or can sign-up with the server management company. They will manage your server and security.
Your service provider should have below qualities -
1. Quality support
2. Quality service
3. 24x7 service support
4. Best technical resolution of the queries within time
5. Proper node support with the best configration